I forgot - batteries:

If you are using a 2.4 radio - definitely 6.0V. 6V would be preferable in general actually provided your gear is meant to work at that voltage (Rx, Sx). Some analog coreless servos were not designed to be run at 6+ volts (full charge) but be careful with low voltage on 2.4 gear, especially Spektrum. My personal favourite for juice is a 2s 2300 A123 pack - absolutely rock solid! I might take 5 minutes just to write about that but if you are familiar with A123's, it won't be necessary. [8D]

If you don't like LiFe or regulated Lipo packs, go with a 5s NiMH pack. (Dang! Those A123's are cool though...)

David.