You've made a good selection imo, I'd always go with Intel over AMD anyday as I know from past experiance that AMD's have overheating issues. I'd also go with nvidia rather than ATI, they last longer, you get more for your money and I've never had a issue with them. ATI on the other hand..I've constantly had issues with, they never last more than 12months despite the price range, the fans are built poorly on them too. Research shows that I3's actually handle gaming better than most quad cores but there's always exceptions ofc depending on what you buy. Whatever graphics card you buy, make sure you have a powerful power supply whatever you use. It always pays to get the best possible power supply, usually I go with a power supply that handles at least 2x of the graphics cards I buy, that way I know that there'll never be any power issues. Make sure you get a case with lots of fans, cooling is key plus make sure you don't place your desktop in a confined space, I always like to either make sure there's ample space on both sides of my tower, or if it's one of those ones you can place flat then add something either side so that there's plenty of space underneath, that'll help with air flow. Definitely build it yourself, it'll be far cheaper to buy all the parts and build it yourself, yes it takes more time and a lot of research to make sure that parts are compatible but in the long run it pays off as your pc will last longer, because you know the parts you've used are of a reasonable quality. Just a few tips, I've picked up on these over the years. Good luck. Edit: I had a little look on ebay for a few options, feel free to have a look mate http://www.ebay.co.uk/itm/ULTRA-FAST-Quad-Core-4-0Ghz-16GB-1TB-Desktop-Gaming-PC-Computer-AMD-/200947550434?pt=UK_Computing_DesktopPCs&hash=item2ec96848e2 - I took the liberaty to working out the conversion rate: £339 = $535 dollars http://www.ebay.co.uk/itm/Intel-I3-4130-Dual-Core-Gaming-Pc-Computer-SSD-16Gb-Nvidia-GTX-660-2GB-Van-B-/141079628547?pt=UK_Computing_DesktopPCs&hash=item20d9004b03 £563 - $905 There's some pre-built ones they look pretty good, but I still think you can do better by building them yourself.