I have a JR 662 I just bought and wish I had gotten it insted of the 400 I started out with, this ones capable of 6 model memory, planes or helis, with all the programing I think Ill ever need, however if you do choose this one I might suggest purchasing it with a better battery than the 600 which comes with it.
I dont think swapping out batteries is an option when your models are programed, unless your willing to re-do that every time you change batteries.