John,
Can't help you with the "where to train" question, but I can say - go with the T/W. As a recent T/W endorsee and low time pilot myself, I find that learning how to handle a T/W plane is a challenge and the training can be frustrating. But.......when you nail your first wheel landing in your RV..........priceless. Oh, what a feeling! You are the master and your plane will love you for it. (Plus taildraggers just look cooler.
Anyway, you are on the right track. Give it a try and then decide. You can still start building and decide later. I did.