If you're into building, I would suggest that the best 1st aerobatic model would be a SPAD Das PlaStick (http://www.spadtothebone.com). The reason is that it's so cheap and quick to build that it gives you great freedom from anxiety. You'll be more relaxed, and willing to take risks (keep safety in mind, though). Of course, you'll plant a few, like I did, thinking you're a better flier than you are, but I think you'll learn much faster.