ORIGINAL: kenh3497
What does your instructor fly? Try out his stuff. If he won't let you, maybe he is not as confident in your abilities as he says he is?????
There you go - great suggestion
I liked my Tiger 60 and the Tiger II is in the size you are looking for - the only plane I never crashed

It was a good starter for aerobatics and with my Prism 7X radio and dual aileron servos allowed me to do all sorts of mixing and endpoint adjustments so it would fly in a Novice patern class.
The problem I see with warbirds is I would want retracts - and there goes your budget out the window. Extras, Edges, etc, are so often set up for 3D and then you need the big engine to get out of trouble.
But the most fun, and absolutely teh cheapest, was the Uproar. At the time it was $50 for the plane and $50 for a Tower 40 engine. It could land slowly but could roll a over 3 times per second. I tought you exponential control very quickly. And if you broke it it was two weeks to build and another $50 for a new one