Swiftech and Enermax also make some very good options. NZXT Kraken is also good.
Personally, if I were going to get a CLC, I'd go Swiftech H220x or Corsaor H110 (2x140mm fans so make sure this will fit).
Good balance of performance and noise.
Sorry to bump this thread, but do you know where I can actually find a Swiftech H220x? I checked newegg, tigerdirect, and amazon, doesn't show up anywhere. Not even as sold out.