Once you've upgraded the FETs, you can try a Plasma Dash or Yeah Racing motor. The SO2s and SO3s are supposed to be nice as well, however, the lack of torque on atleast the Plasma is less than desirable(few extra winds or stronger Neos could probably take care of that). Seems like you are looking for a topspeed motor anyway
You could always must build your own motor from the ground up. I'd suggest Neo mags, carbon brushes, BB can, for sure... Number of winds and gauge wire can be changed out to fit anyone's needs.