Lots of motors to consider. I've been running everything from the Mugen X12, RB X12, OS-TR, to my current Sirio EVO2 modified by Murnan. Only problem I've had with the Sirio, is the carb. I installed a novarossi carb on my Sirio, and wow.
Take into consideration on the track sizes that you plan on running on. One of the best motors to consider, is the NS12S3A1 Novarossi NS3... Great power, easy to tune, and easy to get parts for.
Hope this helps.
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