Doesn't look like you need much help, your system is almost perfect...So I'll just give some opinions. Since you live in the UK...Amazon.co.uk/overclockers.co.uk, best retailers in the world...Let's go:
CPU/Mobo > Nothing much to say. I do find the TUF series are a bit spartan for the price, but I collect their Mobos...so, go figure. Better equipped Mobos for the money from MSI/ASRock.
GPU > MSI 770 Lightning. A bit expensive, but trades punches with the GTX780's, and has a switch for even higher overclocks, without voiding the factory guarantee...Waitin on two from Caseking.de...
RAM > Haswell resolves this situation...I've managed 3000mhz, without any effort. The new memory controller on Intel Haswell chips is pure genius...Something they got right. Buy 1866mhz memory from a good brand and you should be able to overclock it to hell, and back. If money is not an issue get a 2400mhz kit, it will run perfectly on Haswell. I have heard that Haswell only works well with 1.5v, but in my experience have not seen this, and have had no issues with RAM voltage (Corsair/Kingston/Crucial/Patriot/ADATA kits).
SSD > I would try to get a bigger one, those 120gb are going to get eaten up really fast, especially if you install your video/photography editing software on them. I personally use Crucial M4 (50% discount at Amazon.co.uk). Also use a 1TB SSD as a scratch drive for CAD/Video/Photo software, because my time is more important than money, and we want to shoot more, and wait as little time possible on the editing side of things. In "real world" scenarios you will not notice much difference in speeds, and Crucial SSD's are probably the most reliable.
HDD > Yes, that one...Avoid, at all costs, anything with "Green" in the label. On second thought, just avoid anything that remotely reminds you of green. Great choice.
CASE > Too personal for me to give you an opinion...Both your choices will serve you well.
COOLING > Since you are going with the sabertooth you should have no issues. I could go for hours on this subject, mainly due to the fact that I prefer air to water cooling. That said, some Z87 Mobos are built for water cooling, my beloved MSI Mpower Max being one of them, and the H100i is very, very good. If you go air, Noctua, Silver Arrow, Phantecs, or Be Quiet!. I am loving my H100is, with Noctua fans...But like you rightly stated, water cooler are good at cooling the CPU, they fall short at cooling the surrounding area (old Northbridge/RAM)...However both the TUF series, and MSI, are built, and tested, to work with no airflow...Go with the Corsair H100i, it is very good, and will avoid other issues with your system (memory clearance)...Besides, the NZXT is epic for airflow...Problem solved ;)
PSU > Never used that series, generally opt for the AX series, but I'm sure it is very good. The watts are fine for another GPU, no worries there. I would just suggest you checking out the Seasonic Platinum Series, and the epic Be Quit! Dark Power Pro 10 850W Platinum (built by Seasonic, but engineered by the Germans). Your Corsair is a very good choice, and will allow, easily, for an addition of another GPU.
Monitor > First part of your build I don't like. The colors are too "washed" for my taste. I would, obviously recommend an IPS panel. If you are going to be editing Photos, and Movies, you need a very accurate color reproduction. Personally I use NEC Spectraview 271/ NEC PA301W (a bit expensive, but the best for work). Recently, I bought 4 "Pixel Perfect" YAMAKASI CATLEAP Q270 SE 27" LED 2560X1440 WQHD DVI-D Monitor, and they are amazing...Really...Awesome ($380 from ebay seller green-sum/ arrived in perfect condition in just four days...And they are really Perfect Pixel, I ran every test known to man).
Of course, if it's just for gaming...
Keyboard > Typing on a Black Widow now...
So you can confidently build your PC...All your choices are very good.
As for the RAM, don't worry about it. Like I said Haswell as resolved the previous issues that existed with high mhz kits...As long as you stick with the good quality brands, you should have no issues. I would just like to call your attention to the Crucial Ballistix Tactical 2x8 kit...In more than two decades of PC assembling, and modding, rarely have I been blown away by such an over performing part...This kit goes like crazy, and it's also very cheap...it must be played with to be believed. Crucial has really stepped up their game.
Hope this helped, apparently WW3 has broken off in the building I am in (hate condos/apartments) so I am sorry for any inconsistencies...It's hard to concentrate through all the screaming.
Have a nice, and carefree, build.
Cheers.