Here's my build minus the OS and case: http://pcpartpicker.com/p/1kNsW
It looks like Newegg is having a massive sale on corsair cases, and I can get the 300R for $50 or a 400R/500R for $70. As far as I can tell, the only differences that matter to me are cooling and possibly extra drive bays and noise levels. I plan on overclocking, though not to any extremes, so I was wondering if the extra cooling power (for now and for the future) would be worth the extra $20, or if there are other reasons to go with one case over the other (note: aesthetics are low on my priority list). I'm also open to suggestions for better cases in the same price range.