Take a look at the new Ultra-rc 50cc Yak. Looks like a spittin' image of the infamous EF Yak. They are claiming sub-16 pound weights with the DA. Quality-wise, the Aeroworks Yak wins, hands down. Unfortunately, they seem to come in on the heavy side. Being that you are at sealevel, though, it wouldn't be much of an issue.
The GP will definitely be the cheapest and easiest to come by, but it is small and heavy for its size, IN MY OPINION (had to throw that in)