I agree, the Super Cub would be the best choice. Another interesting plane is coming out from E-flite. It is slightly higher price than you are looking for but not by much.

http://www.horizonhobby.com/Products...ProdID=EFL2725

If you want to stick with electric foamies after you graduate from the trainer, look at the Parkzone T-28. it is an excellent low wing sport plane.