I have had a SPEC Kevlar clutch in mine for a little over 2 years now and have been very happy with it. I did have a RAM HD clutch in there but I drove through the RAM clutch in 3rd gear, (once the tires hooked up). The SPEC clutch is very smooth for a Kevlar clutch but does need some practice to find the sweet spot to pull away smoothly without stalling. Some of that could be that I changed to an aluminum flywheel at the same time as I did the clutch. SPEC also do a carbon clutch which has a much higher torque capacity but is quite grabby for street use. Look here.
http://www.speclutches.com/specMain.html