RE: Buying new radio for 426 and 422
Lots of people have switched to Lipo's, I haven't. I think that is a bigger issue if you went to the JR/Spektrum line, but Nimh's are fine with the Futaba stuff.
I use 720-1000 mah NIMH's now either 4 or 5 cells, both work fine. Just condition the NIMH's in with serveral slow charges and keep a good eye on them and they will work just fine. I can get you a picture of the install later today. Real simple, I just use Heavy Duty Velcro and plop it to the bottom of the fuse. I take 1" pieces of nyrod and glue one to the bottom of the fuse, and one to the side of the fuse (90 degrees) to each other and stick the antenna ends through the nyrod and tape down the antenna just as it comes out the tube.