Throw a 10 turn or lower brushless setup in there and toss in a lipo and you'll be all set. The Traxxas VXL system is user friendly and makes good power/tons of torque, but it's not very adjustable. Maybe take a look at Castle Creations Mamba/Sidewinder 4600 or 5700 systems as well. If you're going to race, maybe consider a Novak, LRP, or Tekin system. You shouldn't have any trouble clearing jumps with any of these systems, especially if you couple it to lipo power.