The Losi 2.0 RTR is going to be by far the best RTR ever released. It's about $600 though, comes with a starter box, a great radio and a good engine.
All that aside, with your building and Nitro knowledge you are silly to buy a RTR. They are all seriously lacking! get a Kit, a roller, or even a used roller...they would all be better than any RTR...Good luck