Unfortunately it's hard to pick a motor solely based on manufacturer's numbers. Some less scrupulous companies shall we say fudge the numbers so you may not be comparing apples to apples. The numbers also don't indicate the quality of the components being used or the motor efficiency. That being said, Neu motors are expensive but they have never let me down. I use the same chart that Mic provided a link to. For help choosing a motor size and KV, your best resources are the good people here on IW and on Offshore Electrics.