Electric powered planes for the most part aren't the best choice for a trainer. Most e powered planes if made from balsa are small, made to be light and therefore aren't very sturdy. An exception would be a bump resistant foam model called a Zagi. They are a flying wing and it can be bought for about for about $110.00. I don't know how it would be for a trainer though. The most sturdy balsa trainers are made for 45 size glow engines and have plywood sides for the fuselage. The ARF versions(almost ready to fly) are around $125.00. The easiest to train on model is the Sig LT40. However easy to fly is a relative term. If you try to fly on your own, any plane will probably crash on you in less than a minute and you proably won't even know what happened!