For electric, I would recommend the Apprentice 15e or the Alpha 450. I've taught about 4 people on the Apprentice, its fairly stable and buddy boxes easily. Spare parts are available from most hobby shops. Remember, 1 battery, 1 flight. You need about 5 batteries to make best use of your training day. I've not trained on the Alpha 450 but I like the Alpha series in general. Nice stable good flying planes. Most of my students get about 6 to 9 flights in on training day, depending on how many students show up. Just my opinion, but 4 channel training will carry you further than 3 channel.
http://www.horizonhobby.com/Products...ProdID=EFL2900 Apprentice 15e
http://www.horizonhobby.com/Products...ProdID=EFL2875 Alpha 450 (also available plane only)
http://www.valuehobby.com/ Some buddies in the club get their batteries from here.
Edwin