I personally started with SuperStar 40 which flys great.

The SuperStar 60 flys great also and is larger but doesn't lose any of the characteristics that the 40 has. I have trained many on avistars which is a good trainer, but no a great trainer. The NexStar is good also, but has features that are no good. I normally turn off all the AFS gadgets. They fight you when you need to learn sometime. The Nexstar does fly well, but not as well as the Superstar. The Carl Goldberg Eagle II flys great also.

Any flat bottom trainer will be a good choice to learn on. It becomes a personal choice on color scheme and which one you like best. The sport trainers such as the Avistar are not my first choice, but will do fine also. They are just not as forgiving with the semi-symetrical wings