In shopping for parts I've came up with a question for some of you old hands at this. I'm seeing amperage ratings from as low as 10 to 25 or 30 on ESC. Can someone explain this to a newbe. Is higher amp better or should you keep lower? Is this the rating that the ESC will stand in draw from the motor before bad things happen? Or does the ESC have a draw itself? I'm getting ready to start buying for my first build and this was another question that came up. Thanks