Well it depends on what type of electronics you are going to load a plane with. What's the weight? You know the more weight you load up a plane the faster she will fly to stay up in the air unless you build a bigger plane. Crash9 loaded a Styro foam Mulitiplex Twinstar with OSD, GPS, CCD camera, 900Mhz TX, then all the plane stuff like 6 servos (two for camera pan/tilt) and a Samsung SD video camera. The plane flew fine and stable but rather fast. Then again a Mulitplex Cularis has been another choice, large bird with a large frontal cavity for lots of gear. Actually I know one is using it for long range UAV flights.
http://www.fpvvideo.com/