That's about what they go for new. to be honest you would be happier with the everest the shaft driven one. i own a rockslide and love it still run it a lot but the clod stall on it kinda sucks. so if i had to pick. the everest would be the way to go. plus it's a little cheaper (135) so take the money you would save and use it for a new servo because that is most likely the first upgrade your going to need.
the MRC is a little smaller kinda 1/12 scale so 1/10 scale will do you fine.