Looking to get some fans

Hello all. Im looking to get some more fans to improve the cooling in my system. For reference i have the Antec 302 case. In this case i have room for 2 120mm fans at the front of the case, 1 120mm on the side, and 1 120mm behind the mobo.

I was planning on putting 2 in the front and 1 on the side, i was wondering if you guys would recommend putting one behind the mobo since the space would be so limited due to the low amount of room and a CPU cooler backplate taking up some of that room. (i dont know if it being so close would make for extra noise).

Also i need some suggestions on some good quality 120mm fans. My only requirements are no LED's, Quiet as possible, and they have to be on amazon.

I use the LC-Power Airazor 120 (LC-CF-120-Pro) The got the best price/silence/airflow value i found. The cost about 7 € each and are quite as fuck. And the look pretty cool. I think they are on amazon.

Any Noctua fan? Quiet as possible, no LEDs.

Check out the E-Loop series from Noiseblocker :

http://www.blacknoise.com/site/en/products/noiseblocker-it-fans/nb-eloop-series/120x120x25mm.php?lang=EN

On Amazon :

I use Noiseblocker BlackSilentFan XL-1 and beQuiet Shadow wings SW1s
Neither of them have LEDs but the NBs have purple blades, depending on the lighting in your system that might look good aswell.

Any specific suggestions on noctua fans?

nf-f12 industrialppc all day long :D lol

Ok so im looking at this one here: http://www.amazon.com/gp/product/B00KFCR5BA/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A23NVCSO4PYH3S and i plan on using pwm to connect the fans, but i have a question. I only have 2 open fan connector slots on my mobo so to fit the 2 in the front and 1 on the side i will need a splitter, what disadvantage does a splitter bring? wouldent it limit the fan's potential? (i was looking at this splitter: http://www.amazon.com/SilverStone-Technology-Sleeved-Splitter-CPF01/dp/B00B46XKKQ/ref=sr_1_1?s=electronics&ie=UTF8&qid=1438831675&sr=1-1&keywords=pwm+fan+splitter)

noctuas come with a splitter, for what you are looking for it wont matter really unless you need insane airflow and loud noises

Ok. 2 questions now. Should i get a fan for behind the mobo tray on my Antec 302? (the fan would be directly behind the CPU).

Also i have a spare prebuilt PC that i have been using as a server and i want to get a fan for it. What size fan would work for it? http://www.newegg.com/Product/Product.aspx?Item=N82E16883220217

never heard of anyone needing a fan behind the processor besides people who do LN2 for evaporation lol i doubt you would need one there ever the 2 front and one in the rear would do just fine, as far as the pre built i have no idea but if its standard size as most pc's then its gonna be 120mm

also dont get the industrial version of the nf-f12 unless you really want it badly lol the regular nf-f12 is more than enough :P

Well from my looking on amazon the industrial version of the nff12 is cheaper than the regular version.

if they are cheaper go for it lol usually they are more expensive

Its definitely smaller. I just dont know how small it is. Im thinking 80mm but im not sure