System Usage from Most to Least Important: Gaming (dota2/CoD), surfing the web and the odd photoshop job for college
Are you buying a monitor: No
Do you need to buy OS: No
Preferred Website(s) for Parts: UK Based retailers
Parts Preferences: Intel for the CPU and Radeon for the GPU
SLI or Crossfire: No
Your Monitor Resolution: 1440x900 (maybe1920x1080 if I upgrade)
Additional Comments: First time building a PC and I want to make sure that all the parts are compatible with each other, I also wanted to make sure this build would work fine with 2 monitors, although I will only be using the main monitor for gaming. Also one big thing that confuses me is all the different versions of the 7950, I dont understand why some are more expensive when they are the same GPU could someone explain the differences between a £250 version and a £300 one, thanks.
You don't need the 7950 for 1440x900, or if you want the 7950, get a new monitor 1080p.
I'd get a 120/128GB ssd, and lower the case down, but still for a good one, for that setup a 500-600w psu will do, the xfx 550 pro is a good option, it's of high quality, it was made by seasonic.
Also get an aftermarket cooler if you want to overclock, the hyper 212 evo is a good choice.
My suggestion : http://uk.pcpartpicker.com/p/BW7N
I plan on changing the monitor I guess so i'll stick with the gpu, as for the case I wanted to keep it because I like it, I can always pay more to get a larger sized ssd. Any idea on the different prices of the 7950?
Because some brands are more expensive, there's always a price variation between the brands, specially the top ones.
But the XFX 7950 is a good card for its price, i'd get that one.
The case seems a bit overkill for the specs you have, but it's your choice, the corsair 300R is a good alternative.
If you can afford to buy the monitor now get it.