67US$ is still a lot of dougb bro. That's a 500GB HD right thurr!
Seeing that the I7 920 can get up to 3.2 on air with the stock, I dunno.
That $$ could go into upping your vid card, which would have more impact on gaming performance.
Don't get me wrong though, if you already got the fastest vid card (the real bottleneck) then by all means, go buck wild on the processor.