I like the 4.10's with the a centrifugal s/c as it takes time for it to build speed. The higher gearing will help to get into the power band quicker. As for clutches, I like the 03-04 cobra clutch. Its a factory piece that can take a beating.
I'll be running an NX 125 shot wet. My buddy has been running the same setup for 5 years and 60,xxx miles without any issues. Just make sure it is tuned correctly.