Build one myself no question. Building these yourself makes it easier in the long run than going the rtr route. I've done both and can tell you that if you end up being in this hobby for a while than you have to tear down your rig at some juncture anyway. Although the RTR segment has really helped keep the hobby going and gets people started I would always recommend someone build one before buying a RTR.

Plus, if you go the RTR route a few too many times you end up with a bunch of crappy 27mhz controllers that you have trouble giving away.