With that rig, you would be able to play all the newer games on the highest or high settings
DirectX 9 Games should all run on the highest (there may be a couple of exceptions) and DX10 should run on medium to high settings (Even the best computers can struggle with DX10 on highest setting IMHO).
All this for £968.11 - You can probably get alot cheaper than this (Cheaper Keyboard/Mouse etc) but this gives you a rough idea of what you can get for your money at least
Been to Bayford Meadow's once, went Karting with my Mum's work. Was good fun - really enjoyed it, although i gave a it a bit to much throttle on the first lap and had a mini spin lol. (Was about 8pm i think, pretty damp track.) Got 3rd fastest lap too, which was quite good. Im sure i will go again soon but it's pretty expensive for me, as i don't have much money :/