Avids
http://www.snowestonline.com/forum/showthread.php?t=261154
I went through this last winter. I would go with the regular avids (not the power claw specific) for two reasons:
1. I had the PC specific ones flex and slip and could not make them work, may have been just a bad set but why chance it.
2. If you ever want to run a CE or other tracks (most) you can with these.
Once I switched back to the regular avids they worked perfect an dI could run my track loose, I just clipped the nubs and should have did it this way from day one.
My stock ones crapped out at 1700 km on boost, i would just swap them right away though.
Avids was good to deal with and would recommend their product, well worth it.