HangerBum,
When you move up from the Aerobird to glow, do NOT go directly to an AT-6. The difference between that small, slow eletric and a glow plane will be dramatic, and you WILL find yourself in trouble pretty quickly if flying without an instructor.
I would highly recommend a trainer, but I doubt you'll take that advice, so please go to something more like a "second" glow plane. Maybe a Four Star Forty, or one of the others that have been mentioned on RCU. (Do a "SEARCH" for "Second Plane".)
Good Luck to both of you, and happy flying.
Dennis-