I like the idea of going to a 6V five cell pack in the Magic. Then we gan get more "ooomph" from the crappy servos it seems we're all using. Right now I have a four cell square pack crammed in on the tray next to the throttle servo. It's a good place for balance. With a hunk of lead on the tail I balance at about 5.25" and it spins really well.

I'd really have to look around and see if I could even squeeze a five cell pack in there, but that's a stellar idea.