I'd also say TRX-4. If you want it to go faster, you can upgrade the motor to a CC Mamba X and Slate motor (2850kv takes 4s max, 3800kv takes 3s max; both have same top speed) or the HW Axe.
If not the TRX-4, then an SCT (Slash, Senton, etc.) would probably be the ideal choice.