As several have stated, the industry standard has become to list the wind and turn of a given motor.
Some aftermarket tuners do include with their motors a dyno sheet on that particular motor's performance. Does this include top RPM?? Probably not - and here's why - there is no standard voltage at which to run the motors to find the top RPM.
Simplest advice for you? BUY A DYNO for your own use to figure out what the appropriate motor for your purpose is. Most people will change the gearing based upon the motor - in this case it would appear that you are stuck with a certain gearset, thus limiting your possibilities. If you buy too hot of a motor, you run the risk of burning it, or your ESC up.
Wilde