Stick to companies who do SxS shock work exclusively for a living like Double E Racing and G Force Technologies and you will not be disappointed with what you get for your money.
If you want to find out how good a particular shock tuner is see what the top SxS teams in Ultra 4, Short Course, desert and woods racing are using and I bet 9 out of ten are one of the above mentioned tuners. The Miller Brothers use Double E Racing for their KOH, short course and woods cars, and Kyle Chaney and Dustin Jones use G Force for their KOH, Desert, short course and woods stuff. Those are all factory Can-Am drivers that can afford the best of the best and they use Gary and George exclusively.
You know what names I don't see on those style race cars? Shock Therapy or Weller.....