Nothing really worth mentioning, it's a tad cheaper. (I kind of suck at building real thight budget pcs)
So redid it with PSU this time:
Case: Coolermaster RC330 V2
PSU: Silverstone ST50F 500W
GPU: HiS HD4850 512mb
HDD: WD Caviar Black 500GB
RAM: 2x2GB Corsair DDR3
Mobo: Gigabyte GA-P55M-UD2
CPU: i5 750
Comes down to a total of £511.82.
As for windows... *cough* it. ^^;