Cooler Master Hyper 212+ - Newegg $37.50
Scythe Mugen 2 Rev B. / SCMG-2100 - Newegg $40
NOTE: I am not sure about the fit for these in your case because it is sort of thin @ 7.72". Try to seach the reviews for people with the same case and cooler combo that you want.
If you want to do your own research these are some great sites, if not the best:Hardware CanucksFrostyTechBenchmarkReviews
Also check out my thread on the same topic: Which i7 Heatsink?
Has alot of good info but, the two I suggested are the ones I would get in your price range, and again most of them in my thread are quite large.