Does this whole lot come in a package,i.e. an already made desktop tower with Windows installed?
Who made it,can you give a link?
The weakest link is the Graphic card,you're guaranteed disappointing when you play some high demanding games.(Don't let the 1GB hyper memory mislead you,it's the GPU chip that matters)
I've come up with some alternatives as below:
CPU Q8200 (£136.98)click here (your Q6600 is obsolete now)
Motherboard Asus P5Q se/r(£85.74) click here
Corsair DDR2 Ram (£35.99)800MHZ instead of your 667MHZ click here
WD 500GB harddrive (£49.14) click here
LiteOn LH-20A1H 20x DVD±RW-RAM DL Lightscribe IDE Int Black (£15.29) click here
Sapphire HD 4850 512MB GDDR3 HDMI DVI VGA PCI-E Graphics Card (£113.83) click here
All for £436.97 when you choose for 5days supersave option.