I've got the Titan Fenrir which I'm very happy with, got good reviews.
Kinda wished I'd spent more and got the Corsair H50, not sure if it performs better. It just looks cool!
Very true, i paid £50.00 new for a TRUE black, used it on two s775 quads clocked at 3.8ghz, (q6600 and q9550) and on a 4ghz i7, coped well with them all, got a megahelims as i fancied the look of it, both are exceptional air coolers, but an ultra at £25.00 ono second hand is a very good bargain.It isnt exactly big money tbh, plus it can be used for your future cpu's as it is compatible with socket 1156 and 1366. I didnt see the OP say anything about a budget just that he wanted the best cooler...
Great roundup Helios, though i found my old TRUE to be slightly better than my current super mega, albeit the ultra was lapped to 2000 grade grit, same fans though, however the fans sound a lot louder on the mega, maybe down to fin spacing?