for Mice I really like Mionix but that is as far as my advice on mice goes.
Keyboards on the other hand, well lets just say I am typing on a mechanical board that is plugged into my phone. I love them and all about them. I disslike Corsair greatly, so I personally will say no don't get a k65RGB but it is up to you. You did how ever say you wanted a smaller keybaord without a numpad, you are looking for TKL keyboards or TenKeyLess is what you want, there are hundred at this stage.
I personally use a Filco Ninja TKL and I recetly bought a Magicforce 68 (see cheap chinese mechaincal) I use the latter for my phone and travel it is smaller than most missing both the numpad and the Function row so it is samll indded.
Other very good mechainicals I can recommend are:
CMStorms quickfire line of boards,
Keyed Up Labs KUL 87,
WASD V2 if you like to customise the colour of the keycaps too right from the store,
Das Keyboards for a more professional style and they also usually have voluem knobs and such,
Ducky are very highly regarded and will do RGB in the Shine 5 and a few others,
Varmillo if you are on massdrop come around every so often,
You may also be interested in 60% boards which are just the letters the numbers and the modifiers like Shitft, Ctrl, Enter and such. No arrows or function row, very small keybaords indded. About the smallest you can get before you start to really have to deal with being short of keys for stuff.
In the 60%s we have stuff like:
The Infinity keyboard from InputClub.
The Pok3r currently on the third revision of the poker now with LEDs but not RGB yet.
And many self build board where you buy the PCB, the case , the switches, the resistors, the leds, the keycaps everything and build the board youself. The Infinity board comes in either prebuilt or DIY version. There is also the GH60 Satan which is completely self built.
Switches. There are a few main companies, Cherry, Gateron, Khail, and a few smaller ones like Outemu and TTC and verious others. Qualtiy is varying depending on who you talk to. Cherry is the old faithful, original , tried and tested. Gateron are newer cherry clones (the pattent ended so people can make copies) and are butter smooth they also comes with clear housings to let LEDs shine through them compared to cherry's black housings. I prefer Gateron to cherry now though both are extremely good. Khail are Razers go to switches, the Green and Orange Razer switches are made for them by khail and are exclusive to razer the regualr Khail cherry clones are in all sorts of boards and are generally regarded as fine though some problem cases come back from time to time. The lower end again are things like the Outemu switches I mentioned. My magicforce cheapo board has Outemu balck switches and I really quite like them I tyeped all this on it, but the switches are a little noisy and stiffer than regular black switches.
Colours nad their meanings:
You have three main styles of switch, Linear, Tactile and CLicky.
Linear which are smooth and quieter provide no tactile feed back or click when pressed. Though I say no click you will still get the sound from the keycap hitting the switch when you bottom out and the slider in the switch hitting the switch housing on the way back up, so they still make noise but not a click while pressing them. Examples are the MX Red, Black and rarer Grey (dark grey also referd to as linear grey) switches
Tactile switches have a bump half way down the key press to give feedback for when the key has been pressed with out bottoming th switch out. The bump can vay in size depending on the particular switch. Browns have the smallest bump and clear/grey have a much larger bump. Still no click sound from the switch only tactile feedback. Examples of tactiel switches are MX Brown, Clear and Grey (light grey also refered to as tactile grey) switches.
Clicky switches are the whole hog, they have a bump half way dow and when you hit the bump it makes an audible click too. Examples of clikcy switches are MX Blue, Green and White siwtches.
MX Red Switches: 45~g actuation force, Linear. Gamers seem to like them as they are fast for double and tripple taps of the key. I find them too soft, theya re in my Filco. FIne but not satisfying. Not usually recommended for typing for long periods.
MX Black Switches: 55-60~g actuation force, Linear. Also liked by gamers though maybe not as much they are stiffer switches. I much prefer them as i like still harder to press keys.
MX Brown Switches: 45~g actuation force, Tactile. Like reds these are soft and have a small, slight bump half way down again gamers like these but they are also suited to longer periods of typing as the feed back is better.
MS Clear Switches: 55~g actuation force, Tactile. Sensing a pattern yet? There are always a few of each type wihich are stiffer. The clear also has a larger bump half way so is more noticabel than the Brown switch. Much loved by the mech community and has had many modification and variations liek teh Ergo clear and the Zealios switch.
MX Blue Switches: 45~g, Clicky. Clues are soft but the adtional bump and click offer a little more resistance so feels marginally harder to press than Reds or Browns. They are loud and will likey get you kicked out of an office, public place or you house if you are gaming at 2AM with them. That said if you are a typist these are the switch for you! Theya re more comfortabela nd natural for touch typing and long sessions of writing.
MX Green: 80~g, Clicky. These are the big daddy of the commonly available switches. Weighing in at 80 Grams ish they are some of the hardest switches available. Again loud but those with heavy hands or looking for a chalange go for these. Less commonly available but still common enough to be found.
MX Grey Switches: 80~g, Linear or Tactile. There are tow of these and both very similar in colour one is linear like the Reds and Blacks and one is Tactile like the Browns and Clears, both are rare and not commonly seen in boards for sale, both hard to press,
MX White Switches: 50-55~g, Clicky. These are also hard to find midrange clicky switches. They are noted for not being a loud click like the Blues and Greens, but are also noted for being very inconsistent in its click, some will be very quiet almost like a tactile with a different feel and some are as loud as the Blues/Greens so it is a gamble. The up side is theya re rare enough you should never have to worry about it.
The K65 has Cherry MX silent siwtches, basically MX red switches with some foam or padding or something to silence them. Slightly different but not enough to warrent it and while they are called MX silent and are certainly quieter than other switches it is still not actually silent if you bottom out the keys.
Gaterons get special metion as unlike others theyr switches are made from different plastics. The houseing are translucent and their stems super smooth. Cherry and other has a slighty scrathcy feel as you press them and the parts rub against each other, gateron has used a plastic that reduces this friction a lot and thus feel much smoother. Their houseings also let LED light through much better.
That is a lot of information and I seem to always retype the whole thing, maybe I should make a blog post and just link that.
For more infor mation ask and for a wealth of information check out /r/mechanicalkeyboards on reddit. I hope it helps.