havve researched a lot of motors and i have found:
novak and lrp: gear to the moon (1st choice)
trinity: they like more than stock gearing but not to the moon (very fast)
orion: stock gearing, like stated above soft and smooth
speed passions: saw these at srs last year and was very impressed
tekin:similar to trinity
your best bet is to find what you like, a rule of thumb however, there is a reason a majority of guys are running a specific piece of equipment.
if i were to spend the money (and i have) the novak is the best bet for power, reliability, and overall bang for buck.
Sean Guthrie and John Soladay
Albuquerque, New Mexico