Both of the warbirds you have picked (the 47 and the 51) are very fast, agile, and will have no similar traits to the Supercub. As such, I would reccomend a low wing sport plane first, something with plenty of wing area, but still more powerful. As this would be your first aileron plane, you stand a much better chance of keeping it in one piece and having much more fun than going immediately to the warbird. A sport plane will be able to fly much slower when landing, and you won't have to worry as much about tip stalling. Look towards something similar to the Sig Fourstar 20 EP in regards to weight, wing area, and general configuration - You won't regret it!

Happy flying!