Tower Hobbies heavy duy.
I have had mine for five years and it turns over my 1.40RX and FI no problem at all. It will also get the Moki going with a little slap of the prop from a helper.
I have the Sullivan hi-torque too and on 12 volts it does not really do any better at three times the cost. Of course I'm sure it is great on 24 volts.
Mark