A Sig Hog isn't bad as a warbird trainer - low wing with barn door ailerons. The Top Flite Contender 60 is a warbird trainer (sadly not a tail-dragger). She's fast, has a low wing and the apron flap gets you used to thinking "I should do something with a switch before I can land" which is good retracts practice.

If you're looking ARF the 4-Star or a Goldberg Tiger, maybe a Kaos.

Warbirds have a high wing loading and fly "heavy" and don't do right-angle pull-outs and such. 3-D models won't help you there. With a "warbird trainer" what you want to do is pitch the prop up - like a 10X8 instead of an 11X5 - to give speed and less low-end torque. Then do a lot of landing practice with the throttle kept to about 1/4 up. You don't float a warbird in.