hi absolute noob, nice nick name
I recommend buying PC parts from amazon, while it is very good store with large choice. First of all I think that you also want some future-proof, so you can upgrade your PC part by part and having better performance. so that's why I think going for intel is crucial. So here is the build -
CPU - i5 4460 @£151.00
GPU - MSI GTX 960 4GB @£184.98
RAM - HyperX Savage 2x4GB @£36.40
MOBO - Gigabyte Z97P-D3 @£64.99
PSU - EVGA 500B @£44.17
CASE - Zalman Z11 @£49.99
HDD - Seagate Barracuda 1TB @£39.75
This setup will be running on high-very high settings @ 1080p, on med-high @ 1440p and also is able to play a movie in 4K resolution.
Please mark this answer as an solution, as it gives me a credit on this forum and I can become a "expert" on system builds
P.S. I own this system, on W8.1 I'm getting on all competetive games @1080p 150+FPS