rc airplane nut... i think you're ready for a yak. as someone said, the bigger the better. but also, there are two very different types of yaks now, the 3D and the scale type. The scale plane will be more robust but the wing loading will be higher. the 3D will be easier to fly but require care since it will be built very light.

i've flown the smallest of yaks, a 15 size from hirobo and let me say... with an ASP30 fourstroke, it flew like an plucked chicken. i'd go with a good light 3D capable yak.