Tried the Puretrak Talent (Still using it now, nearly two years old!) Razer Mantis Speed, and Steelseries QCK+.
Out of all of these, I can confidently say that I prefer the Puretrak Talent, the pad hasn't worn too badly, and apart from the coffee stains and the general dirt on the pad, I still manage to track well in most of the games that I play.
The next pad I want to try and will probably switch to is the Xtrac Hybrid, mainly because I'm interested in the surface. If that doesn't go too well, and im still playing games, I'll switch back to the Puretrak Talent, but I dont want to replace it just yet. I do ~400*c over my mousepad.