nanohex:
but anywhere between 5V and 46V so that's a huge range of options for how powerful your motors are
So more voltage doesn't result in a higher current draw?
Thanks!
If two motors are rated at the same power, but one has a higher voltage, it will require less current. Or, to put it another way for this situation, the higher the voltage the greater the power you can get from your supplied 2 Amps current. It will be determined by how much battery/motor/etc you can fit into your class weight and size limits.
Enjoy your designing 
Geoff