Here's another "Efficient" option:
http://www3.towerhobbies.com/cgi-bin/wt ... LXEXK1&P=0
Another:
http://www3.towerhobbies.com/cgi-bin/wt ... LXHCJ2&P=0
A little more scale:
http://www3.towerhobbies.com/cgi-bin/wt ... LXHCJ9&P=0
I think there are planty of different cheap airframes that are big enough to fly with the sonic combat modules. We'll just have to figure out several "approved" air frames to keep it affordable and fair.

