RE: Bi-plane as second plane?
I started RC airplanes this past December. I bought a Seagull Decathlon 40 size. everyone has said - NO, don't fly it unless you want to crash it. So, I bought a Great Planes Escapade. very fast plane. first landing was rough - second was good - 3rd I greesed it. Maybe it was all beginners luck. I soon then purchased an Avistar trainer - I ended up converting it to a tail dragger during the build. Both planes I have now crashed and rebuilt and rebuilt and rebuilt. all the crashes have been due to dead sticks except for the last one which I really damaged my Escapade (need 3 weeks of repairs). Yesterday, I decided to be brave and take out the Decathalon. Yes, it was everything that everyone has said - ground control difficult - but "I did it". It flew and landed with no problems. Actually, once I got the plane trimmed it flew wonderfully. So, this may not be the best advice to give but by all means - give it a try.
Oh, I flew nitro helicopters for a few years before airplanes - maybe that helped in orientation and rudder control. I fly with my rudder all the time with the helicopters and I found out that I fly the rudder all the time with the airplane.