You might want to look at the Seniorita. It's larger than the Timber, uses a four channel radio and only needs a 400-700 watt Outrunner motor with ESC and battery pack to match. You can probably use the transmitter you already have, just add a receiver and four servos and you're good to go. Granted, the Seniorita isn't a plug and play like the Timber but it is a big step up in quality over the foamies. It will also cost you more than the foamies will since it's not what amounts to blow-molded styrofoam