Well the highest power draw is definitely going to come from 2 of these motors http://banebots.com/p/M5-RS550-12 which list 14.4V/85A max power draw. Obviously I wouldn't want to run them at that for any length of time, but is there a way to narrow my search for boards that will handle that voltage, the moderate needs of a few smaller motors/servos, and the modest needs of a microcontroller and a few sensors. It is a team of robots with slightly different configurations, but the motors and controllers are the same, and I'd like to use the same board across each for consistency.