think long and hard about either the 6xas or 6exa.. I had the 6xas exactly a year before I outgrew it. (actually outgrew it earlier, just didn't want to replace it that quick...) that line has some serious limitations. heli support on the 6xas line in minimal at best, and the lack of good mixing is a problem. (dual elevator servos are becoming common on 3d planes, which isn't possible on the 6xas without mixing on the plane side)