there are so many .. speed passion just won the worlds but .. not a 17.5.
some motors have more k/v ,,, some have more torque. choose one for your app. over the past , rpm seems to have the upper hand. especially in "stock". I am not partial to any brand, I have novak and hacker motors.. thay all rock! think i might just have to try a speed passion. tell you the truth , its all about the gearing. Start conservitave and work your way up. and dont hold back on anything you might find.