Case: Personally, I prefer Corsair cases to Coolermasters', but you can't really go wrong wither way. I'd certainly consider going for the slightly cheaper Corsair Carbide 300R over the Storm Scout II, though. But that's just me.
CPU: Both great, but I'd go for the 4790K in a heartbeat as it's only a tenner or so dearer than the 4770K. But if you want to save a heckuva lot of money and sacrifice minimal performance, buy a last gen CPU and save, like, £100 or so.
GPU: I prefer Nvidia cards, but AMD ones tend to be quite a lot cheaper and offer similar performance. I'd begrudgingly go for the 280X in this case, but save some cash and go for the
XFX model. There's a chance it might come down in price even more soon, as I bought one about a week ago for £190. If money is no issue, go for the GTX 780, but the GTX 770 will offer you slightly weaker performance for around £100-£150 less. Also, I'll say this for AMD's modern Catalyst Control Center software: it's bloated as frig.
RAM: Prefer Corsair RAM, but for plain gaming it shouldn't be an issue. I would consider opting for RAM with lower (read: better) latency speeds if you intend to muck about with video editing and or multi-task with a billion programs running at once.
PSU: Looks good. Bit pricey, though. My older generation Corsair AX1200 cost the exact same amount (£99.99 as of this post), but that'll likely because my PSU is only certified 'Gold' and not 'Gold Plus' like the one you have in mind. This is another instance where going 'last gen' could save you 30 or so notes. To be honest, the only reason I went for the AX1200 was because I at one time wanted to go for either a Tri-SLi or triple CrossFireX set-up, something which a RM850 couldn't handle, but thankfully I came to my senses.
HDD: Which model? Unless it's been superseded since building my last PC, WD's 'Black' range was their cream of the crop, and 'Green' was their, well, 'greener' offering which lacked in performance but didn't consume as much power. I've used both Black and Green WD HDDs in the past (two WD Blacks, now that I think about it) and had one fail in less than a year. I lost a lot of friggin' data and I was not happy. Backup frequently was the harsh lesson I learned from that experience. Samsung Spinpoints are a great alternative; I've had 3 of those bad boys and one is still going strong in Angel's computer - after 6 years or so.
SSD: I love Crucial SSDs. I've had 2 Crucials (one 128GB and one 256GB) and 1 Kingston (can't remember the model number but it's in use in Sharon's computer now) and all were fantastic, but after Crucial released a firmware update last year, they rocketed up in speed. It was a really big thing in hardware coverage circles. The SSD you're looking at is the model up from mine, and I would imagine that it'll be great. SSDs are also so much more affordable now!
OS: I prefer Windows 7, but would really encourage you opt for Windows 8, even though it is a bit of a muddled OS. Prices between the two are very similar, but Windows 8 is supposedly improved in most areas and will obviously be supported for longer.
Just my two pennies!
