Graphics card.

[Furunculus]

Games these days are much more cpu limited than gpu.

i'd say the opposite personally.

my mum has my old pc with a Q6700 (the one up from here) paired with a GTX460 (the one down from 560Ti) and she is going great-guns on skyrim with graphics maxed out and all that jazz.

if GB were going to spend £450 on a top of line AMD 7970 then i would agree that his Q6600 would be a bottleneck, but, a £150 560Ti should be more than worth his while.