Amuro:

The single-motor KT is the 56004, and originally came with a 53400 traverse unit (still available) and a muzzle flash unit. There was to provision for main gun elevation, but it could be rigged if you were inventive. If you just want to hack around, the old model is fine, but to battle, you'll want to get the 56018.

And if you do decide on the 004, you may wish to swap the motor out for an Integy #5501 55t lathe motor. Its been reported to turn the overly-fast stock speed to right on target.

And its ~possible~ that the Leo's price may drop a ~bit~ when Tamiya's next tank hits the market in a few months (as rumored) Then again, it is a much fancier tank than previous DMD-MF units, so I'd not count on it.