whatareyoubuyingthatforyoufool @ Corsair H70. The H50 reviewed poorly at SPCR - silence and quiet computing experts, which has put me off the whole series, maybe it's unjustified, but I'd much sooner suggest a good air cooler at around £40. The Scythe Yasya, which has a fan control knob which needs to get mounted in a PCI-E expansion slot. Another one that I like the look of is the Thermalright MUX-120 Black.
I don't think it will be that easy to get the Scythe Mugen 2 (Rev B), but is a seriously good cooler with a quiet fan, so would be worth having.
whatareyoubuyingthatforyoufool @ GTX 465. They have poor performance and are noisey, especially compared to a GTX 460. Altho I'm skeptical that you will need that much power from your graphics card for the kind of build you are wanting. I think a large fan on a graphics card is a good indicator that it will run quietly, but checking reviews would be a good way to back that up.
If you don't get a very powerful GPU, or only one GPU then you definitely won't need a 750W PSU, depending on which graphics card you decide on you could run your build comfortably on a good 500W PSU, therefore saving a sizable amount of money. Even if you go for a 'best in class' 500W. But you should decide on what your plan is for GPU and future options, CF/SLI, replacing it in the future, etc. Altho I doubt you will need to spend much more than £70 on a PSU.
I don't think the WD FAEX 1TB is a good choice for a hard drive as the Samsung Spinpoint F3 is, according to the reviews I read, the better performance, in all except booting. Not really worth the extra ~£15 imo.
I do like the RAM, 8GB in 2 x 4GB configuration for a very low price. Used to be that you'd have to spend over £150 to do that.
The fact that that case only has one fan will mean that it's quiet, but how good will it be at shielding your ears from the noises of the fans and components inside the case? Maybe it would be a good idea to buy a case with a better reputation for being quiet, check this out: http://www.silentpcreview.com/article75-page5.html
It is certainly possible to get very quiet builds these days, but you definitely need to be conscious of that choice when buying, I wasn't with my first build and consequently I'm not happy that it's as quiet as I want it or as quiet as I could have gotten it.