Get something which is easily repairable, this isn't always foamies. Something with a short moment arm which some of the so called 3D models don't have!
don't look at the beginning of this clip, but after a few minutes are some home designs, sometimes i use the wing or fuselage of a ARTF and make a new design. http://www.youtube.com/watch?v=GTtxStJJyFI