Short, twisty track, I have two suggestions.

1. HP isn't so important so go with strong but inexpensive. That would be the Kangaroo I linked to earlier.

2. If you just have to have that tire spinning, gear stripping, stump pulling power out of the whole and have money to burn, you can't beat a 35+21. Especially a tuned or Murnan version. I really don't think you will need that kind of power for a short track though unless it's SUPER high bite.