I'd say that the Hyper 212 and the V8 are fine choices for any decent OC, but if you have the money, the H100 from Corsair is the best you can get.
Liquid cooling solutions are a little more user-dependant though, but should not be that much of a deal.
Now, in particular to your question, I like the V8 more than the 212, but the 212 edges it out but a little. So, the cheaper one should be the good call :P
Here's a pretty good review for he H80, the second best from Corsair and it lists the V8 and 212 in the big chart they use:http://www.frostytech.com/articleview.cfm?articleID=2664