Hey, I was just wondering if there's anything I could change to make this spec any better, I'm not very good with computers so any advice is very welcome. 
It will be mainly used for gaming, so it needs to run games like GW2 and BF3 'n' the likes. =]
Thanks!
Gigabyte GeForce GTX 560Ti OC 1024MB GDDR5 PCI-Express Graphics Card £179.99
(£149.99) £179.99
(£149.99)
Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - Retail £169.99
(£141.66) £169.99
(£141.66)
Asus P8P67 LE Intel P67 (Socket 1155) DDR3 Motherboard - (Sandybridge) ** B3 REVISION ** £68.98
(£57.48) £68.98
(£57.48)
XFX Pro 550W Core Edition '80 Plus Bronze' Power Supply £54.98
(£45.82) £54.98
(£45.82)
Zalman Z9 Plus Tower Case with Fan Controller - Black £44.99
(£37.49) £44.99
(£37.49)
Seagate Barracuda 7200.12 500GB SATA 6Gb/s 16MB Cache - OEM (ST3500413AS) £28.99
(£24.16) £28.99
(£24.16)
Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX4GX3M2A1600C9) £26.39
(£21.99) £26.39
(£21.99)
OcUK 22x DVD±RW SATA ReWriter (Black) - OEM £16.99
(£14.16) £16.99
(£14.16)
OcUK Value 2.0 2 W RMS USB powered Speaker Set £4.99
(£4.16) £4.99
(£4.16)
TDK DVD+R 16-Speed 4.7GB - 25 Discs (DVD+R47CBED25) £3.98
(£3.32) £3.98
(£3.32)
Sub Total : £500.23
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £12.50
VAT is being charged at 20.00% VAT : £102.55
Total : £615.28

It will be mainly used for gaming, so it needs to run games like GW2 and BF3 'n' the likes. =]
Thanks!
Gigabyte GeForce GTX 560Ti OC 1024MB GDDR5 PCI-Express Graphics Card £179.99
(£149.99) £179.99
(£149.99)
Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - Retail £169.99
(£141.66) £169.99
(£141.66)
Asus P8P67 LE Intel P67 (Socket 1155) DDR3 Motherboard - (Sandybridge) ** B3 REVISION ** £68.98
(£57.48) £68.98
(£57.48)
XFX Pro 550W Core Edition '80 Plus Bronze' Power Supply £54.98
(£45.82) £54.98
(£45.82)
Zalman Z9 Plus Tower Case with Fan Controller - Black £44.99
(£37.49) £44.99
(£37.49)
Seagate Barracuda 7200.12 500GB SATA 6Gb/s 16MB Cache - OEM (ST3500413AS) £28.99
(£24.16) £28.99
(£24.16)
Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX4GX3M2A1600C9) £26.39
(£21.99) £26.39
(£21.99)
OcUK 22x DVD±RW SATA ReWriter (Black) - OEM £16.99
(£14.16) £16.99
(£14.16)
OcUK Value 2.0 2 W RMS USB powered Speaker Set £4.99
(£4.16) £4.99
(£4.16)
TDK DVD+R 16-Speed 4.7GB - 25 Discs (DVD+R47CBED25) £3.98
(£3.32) £3.98
(£3.32)
Sub Total : £500.23
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £12.50
VAT is being charged at 20.00% VAT : £102.55
Total : £615.28