As I think someone said before, a 19t spec motor is a good start - I've raced one at Nationals, Regionals and club days against modified motors. The only place it loses out is down a straight but if it's geared well it shouldn't be too bad.. I always found it was quicker in the corners as its so much more drivable than something like a 10 turn.
I just got a 14x2 off ashley for my 2WD - when I started racing I used a 14x2 also - it's probably fairly similar to a 19 spec motor to drive.
I wouldn't worry about rpm / torque too much, or at all. a decent 19 or mild modified (14-15-16-17) should be good. I like the peak/orion V2 style motors myself but other swear by the checkpoint series. I'd get either of those over any other style to be honest.
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