Thanks for the help, everyone. I'd still like to avoid getting both kites if possible, primarily because the power interests me the most and I don't want to spend the time/money learning a trick kite just for the "training" aspect of it. Please give me your thoughts on this plan: I'm thinking that I might try to learn on the 2-4 on days/areas with very light winds. In my area, those days are common anyway, and under very light winds I understand it might even be easier than keeping a 1.5 up. Then, as I get better, I can use it in stronger winds.
So my bottom-line question is, would it be possible/practical to take this approach or am I just setting myself up for frustration in trying to learn with a kite that isn't made for beginners?