The servos aren't so much for 3d, as the fact that I have a tendency to do high speed snaps, and flat spins. I have had alot of experience
with the 5645 and 5625 and they are good servos, I have heard alot of complaints about centering but I had 5625's all around on my 69" yak,
and 5645's on the elevator and ailerons of my 77" Goldberg Extra, and never had any complaints. I would definitely reccomend the 2300
A123, very light and easy to setup, no need for regulators, If you go with the ignition battery elimination filter (IBEF) you can run that whole plane
off a single 2300 A123 (as long as your IBEF is regulated below 6 volts).