I would say go with the QQ Yak, but after reading the MAN review at 18 pounds, I'm not so sure. Of course, the guy threated it like it was a 40%er, adding smoke, dual 4000 duralites, a powerbox, pilot, all 5955's (heavy servos), abd a bunch of other unnecessary junk. Still, I don't know that it was 2 pounds worth...
If you use minimal equipment, you should have a TRUE 50cc-class plane in the 15.5-16.5 pound range. With that said, the Aerotech and Lanier Yaks are out of the question. The TOC is questionable, and the GP and CG Yaks ARE NOT true 50cc planes (too small). So, by process of elimination, the BME and maybe QQ Yak are the way to go.