I don't see the OCZ on this comparison chart, but both versions of the thermalright ultra 120 come out on top.http://enthusiast.hardocp.com/article.html?art=MTU3MywzLCxoZW50aHVzaWFzdA==Some testing disparity emerges in comparisons by different reviewers if different fans are used or if the testing methodology changes, and hardocp seems to try hard to eliminate (or thoroughly document) any changes to their test setups.
Use Artic Silver. MrRip back me up on this. Supposed to be best if I am not mistakin.