It is a good set up by woppy, but if its purely for gaming Id look at a dual core AMD with a better GPU personally, also just to note the HDD he included the green is more of a storage drive than a main drive
Hows this look?
OcUK Value ATI Radeon HD 4890 1024MB GDDR5 PCI-Express Graphics Card - Retail £121.98 (£106.07)
Asus M4A79XTD Evo (Socket AM3) PCI-Express DDR3 Motherboard £83.98 (£73.03)
Coolermaster Sileo 500 Silent Case - Black (500w Extreme Power Plus PSU) £79.99 (£69.56)
AMD Phenom II X2 Dual Core 550 3.10GHz Black Edition (Socket AM3) - Retail + Colin McRae Dirt 2 Full Game £77.99 (£67.82)
Corsair 4GB (2X2GB) DDR3 PC3-10666C9 1333MHz Dual Channel Kit (CMV4GX3M2A1333C9) £72.99 (£63.47)
Samsung SpinPoint F3 1TB SATA-II 32MB Cache - OEM (HD103SJ) £66.99 (£58.25)
Sony Optiarc AD-7240S 24x DVD±RW SATA ReWriter (Black) - OEM £18.99 (£16.51)
Sub Total : £454.71
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £11.75
VAT is being charged at 15% VAT : £69.97
Total : £536.43
Comes to a bit more but it includes new case (very good one too), fast GPU, better suited HDD, if you can afford another £20 on top of this I'd recomend an aftermarket CPU cooler like the Akasa 968, will make system run quieter, cooler and allow OCing
Edit: Oh and you say £600 in title but then £500 in main text, can you clarify which is correct