Hi Aquila, Indeed I agree with tailskid there are tons of used servos out there of all brands that are perfectly good and can be purchased very cheaply. In your case with the modern airtronics Z plug (that's the blue ones) receiver and switch harness it makes much more sense seeking used servos when the time comes is to smply avoid the Old Syle (black plugs) servos altogether. There are adapters avalible but that is and extra expense for each servo that is unneeded if you look for other compatible servos. There really is not going to be any difference in price.

All hitec servo plugs are compatible, all JR servo plugs (not wall chargers are compatible) are compatible and All Futaba J plug servos are compatible if you shave off a single spline on the male plug with a hobby knife. Oh of course the blue plug Airtronics servos too.

The servos to avoid in the used market for you would be old style (black plug) Airtronics servos, Old Futaba (G) plug servos (these are easiy to spot since the plug pins are at a ninety degree angle and the maie pins are exposed) and finally any brand servo with four four wire conductors.

John