Don't know the Race Tech stuff as well, though it's certainly been around. We've been happy with the Elka shocks, and as for rebuilding, we have used GP Suspension (when Will was racing, he used their stuff a lot, and was very happy with it.).
They are out of Portland, Dave Hodges runs it.
Best,
Cobie
Thanks for the reply Cobie! The info you provide is very much appreciated!