I highly recommend the Hobbico Avistar. It is definitely forgiving enough as a trainer and, with a semi-symmetrical wing, is great for beginning aerobatics. It comes in two ARF forms, one of those with radio gear and engine at a very good price. Check it out on the Tower Hobbies website.

I realize that there are a lot of posts here for Sigs. But be sure to look at the Avistar before making your final decision.

MrJB