Ι always build my pc i don't take the ready ones!
Yeah you get a lot for your money these days, all this fancy high end stuff coming out driving the prices of the mid range down The GTX 460 is a superb graphics card great frames to £'s and you can also scale up if you run 2 in SLI it will match anything at the top end and be cheaper!
I made my own pc with 800euro(no screen mouse keyboard)and it was better from a 1000euro that i saw!