I've had a couple of students show up with the ares gamma pro:
http://www.hobbytown.com/Shop/-Ares-Gamma-370-PRO-RFR/

for $99 it's receiver ready. if you were to buy a Spektrum DSM receiver, you could use the same TX as the champ.
IMHO, you'd be much better off spending the extra cash now and purchase a more capable transmitter to use with the Champ AND the gamma.
(something like a DX-7s)
hope that helps!