I've put together a list of planes that make good trainers and second planes. All of them on the list are proven planes that are well suited for successfully letting students learn to fly, or advance to a second plane. Check out the list here
[link=http://www.rcuniverse.com/forum/m_4537845/tm.htm] Looking for a trainer- what's available. (Updated 12-20-07) [/link]

Hope this helps

Ken