So right now I own a G19 Gen4. I want to shoot more than one division and it looks like the G29 and G30 will allow me to shoot every other division except unlimited. The question is whats the difference between 10mm and .45 auto. Which is cheaper, less recoil, better to get for competition shooting. Granted I will be getting a G34 Gen4, which was actually going to be my next gun, for unlimited but I want to be able to shoot as many division as I can to start.