RE: Change from 4.8v to 6v
i have used a 6v setup with futaba radios for a long time and have never had any problems. They make your servos put out more torque, and they respond quicker. The thing is, if you get a 6v 1000Mah pack, it will have less runtime then a 4.8v 1000Mah pack. BUT, i use a 6v 1100Mah pack and can go all day (half gallon worth of flights, or more) with one charge. good luck, the 6v is a good choice, as long as you get a high capacity.
sean