I am looking to build a gaming PC for £650 and have come up with this so far:
http://uk.pcpartpicker.com/p/3aKQK
I will be looking to upgrade components in the future and I want as many FPS as I can get, what are your guy's thoughts, any thing you would change considering my budget and needing to buy a monitor plus Win8.
I think this build is absolutely spot on. However, I would change the wifi adaptor for something like a powerline kit. Powerline uses the electrical circuits in your house to create a hardline to your router. Faster, more reliable, more secure.
One more suggestion. I would swap the Seagate Barracuda for a Western Digital Caviar Blue 1TB. Approximately the same price, better reliability.
Berserker is spot on. Build looks great an a powerline kit is probably better than a wifi adapter :)