Looks like a pretty nice build! I do have some minor suggestions though
That motherboard, although quite good, is quite expensive. You could get a Gigabyte DS3
for about $70 less and still get some nice overclock results. And if you don't want to overclock, you might want to look into getting a Intel-brand motherboard for even cheaper.
A 7200rpm HDD is fine. Games don't rely so much on HDD access time/latency/etc as they do on graphics and processing performance. If you were concerned about it, get a second HDD and set up RAID-0, or even get a Raptor HDD (10k rpm) to install your OS on.
And yes, that cooler is pretty good. Just remember that that heatsink is massive (and massively heavy). If you attend lan parties or otherwise transport your computer anywhere, you are going to have to give extra attention to carrying it sideways, so that the HS stays where it should.