I have been in your precise situation. Buy a Mountain Models Magpie. Get the two-wing kit, so you can fly it as a three-channel, or as a four-channel with ailerons. I went from the Challenger to the Magpie, and I love it. You can't go wrong with the plane, and the folks who sell them are really nice as well.
http://www.mountainmodels.com/magpie.php
Ray out