Xraycer... you're right... "need" was a bit strong. I'll agree. we have a few that are still all stock that are just as much fun to run as the custom builds.
it kinda depends on what you're planning on doing with it... most indoor mini crawling courses are going to be set up for the SCX24'S. If you're planning on running it mostly outdoors then I'd go with either the Capra or the mini Capra (UTB18). Any of the rtr are going to need upgrades no...