How much experience do you have with monoplanes? If you are an intermediate pilot, then a byplane shouldn't be too difficult. I have a Pitts (Cermark) and a Goldberg Ultimate. Neither are really easy to fly, but are allot of fun and very aerobatic. The more aerobatic the byplane is, the more it can be a handful.

A key thing with a biplane is that they have much drag and require power all the time to fly. Now that being said, I have a friend that built one from scratch using two Sig Kadet Senior ARF wings. That had to be the easiest, slowest biplane I ever flew, and it was a fairly windy day. He had a OS 1.20 (pumped) on it and the engine was dead sticking, which it did on me just as the nose lifted and climbed about six feet. Normally that would have been it for my pitts or ultimate, but I just pushed forward on the stick and glided this beauty in with no problem.

The range you are looking at would be a 1.20 sized Stearman or something in that range. There are a bunch of biplanes out there, so it is pretty much up to you, how much you want to spend and how big you want to go. The thing with most planes, is the bigger the better. This is true of Bipes especially. There are a couple of small ones that fly really well, but are very quick and unforgiving. The Great Planes Pitts and Christen Eagle take a wide range of engines, my recommendation would be a Moki 2.10 or ST3250 on either, or a 50 to 60 gas engine. The later being more expensive and heavier.

Aeroworks has a 27% Ultimate made for a light weight 50cc gas, that a Moke would work on too. I have heard allot of good things about this one as well.

My Goldberg Ultimate is hanging in the LHS for sale, my pitts is still in my hanger. Color preference really, I can see the pitts red and white much better than the blue and yellow of the ultimate. Just had the pitts longer, and have an attachment to it. Both of those planes will fit in my minivan assembled, which is a plus with a bipe. The bigger ones usually have to be transported in pieces and assembled at the field, so you may want to consider that as well.

Good luck in your search for a good bipe.