I'd absolutely suggest the Hog Bipe. Good flying plane, flies well on a wide variety of motors, and the kit is top notch. Both in the air and on the build table, it is widely regarded an excellent first bipe.

Sig is ell known for providing high quality kits with good, well written, easy to follow instructions. The hog bipe is no exception, and since it's been around for YEARS, there will be no shortage of support and advice from experienced builders here.

Finally, Bipes tend to have their own "quirks"...not that they don't fly well, rather they tend to have their own behaviors unique to bipes....the hog bipe, ime, has the fewest of these in the lowest degree, making them an excellent choice for the transition.