RE: After mastering a "second plane", what next?
The only concern I would have with a Bipe is the way they handle. Depending on what you get, they tend to be a tad more reactive to inputs. This is not bad, just different. If you are ready, and willing, then go for it. They are not "my bag" and I don't like them all that much. Now, I likle to look at them and watch them fly, but I just don't have any interest (right now that is) in flying them.
CGr.