US Aircore Barnstormer. Especially if it's one of your first planes. I've built balsa planes since I was a kid so the switch to larger RC planes wasn't that large of a step. But the Aircore planes are basically "plastic cardboard" and you fold them together. Leading edges were not straight, and as a result each wing of the biplane wanted to go its own way. Trim that out. On the maiden flight, my instructor had a total flight time of 18 seconds. Its in a box in my garage/hangar. Go with the traditional building methods. I'm not knocking Aircore, just the building method.