Best s939 cooler for , $35US?

I am still running stock cooler and would like to get a little better performance.

Your wisdom and insight will be appreciated.

Scythe "Ninja"
If you can find the Sonic Tower its excellent as well.

The XP90 is on sale at SVC with a coupon for $25 and this coupon code, XP90425. You still need a fan, but you should come in around $35. Also the Arctic Cooling Freezer 64 Pro is about $30 with a fan and is excellent.