I just finished training on the Alpha 40 and I would recommend it. It is a very stable trainer that is capable of aerobatics as well. First, however, I would recommend you find a local club and talk to their trainers before you buy anything. Your instructors will be a wealth of knowledge and they can help you choose between the two. I also would ask yourself if you want to fly glow or electric after training is over. It is easy to start off in one or the other, but it can be expensive to move from glow to electric, or electric to glow since different field equipment is sometimes needed.

Indy Park Flyer
Hangar 9 Alpha 40
Hangar 9 Pulse XT