I'm happy with the Twin Frozr II, I like the dual fan design versus blower style cards. I can barely hear mine at 60% fan speed/70c temps which is the most I've seen so far on a hot day (no A/C here, ambient temp in the room 25-26ish).
The Asus DirectCU II also has great reviews, so I'd go with whichever is cheaper or has bundled games you want.