There are not that many "trainer" gliders that are 4 channel (with ailerons), there are some 3 channel gliders. Gliders are great planes to learn on, nice big wingspan, and forgiving. Take a look at these:

http://www.hobby-lobby.com/easystar.htm

http://www.e-fliterc.com/Products/De...ProdID=EFL1075

http://www2.towerhobbies.com/cgi-bin...?&I=LXHPD0&P=7

The last one is a 3 channel, but has ailerons and no rudder.