RE: At-6 for 3rd plane?
If you think you can young Jedi then you can!!! Those who think they can't will not! My second plane was a 540 edge... Put it on the buddy box with your instructor... Land it with some speed and you will be fine... Don't try to float it in like a trainer. AT-6 easiest of warbirds to fly it was a trainer. Listen to the instructor at your club he knows your skills better then anyone. If he says you are ready then go for it. It's only money... LOL
I started last yr and now fly 2 Gee Bees / DR-1 Fokker / WACO Biplane / 540 Edge / Stuka Thats my own stuff. I've flow just about anything you can think of.. out there.