The Edge 540 is without doubt the most stable of all the big scale aerobatic airplanes out there at the moment. It will also do everything you require of it at your current level of flying.
Having said that, not all kits/ARC's/ARF's of Edge's are the same.
The AeroWorks 33% ARF is a good start. Little on the heavy side, but a very strong airframe. I helped a fellow flier who went straight from a .40 sized 3D aircraft to the above airplane with a DA100. This by the way was not some young hot shot kid, like me he was the other side of 40. Go back to the buddy box system until you get the feel if you have to.