no offense or any thing, but why bother? you have a nice mountian bike, why bother getting a crummier one?
the insync fork is a really horrible fork. I was looking at mountain bikes in that price range for a while, and that is a really crummy fork. I doubt that the RST would be much better.
That aside, there are nicer bikes out there in this price range. look at the specialized hardrock. IMHO, it is the best value out there in that price range.