Mike,
Since I know where you are in your training I will forgo the don't do the biplane as a second plane recommendation.
When you are ready, I would suggest the Tiger Moth as a first bipe. The are very gentle and predictable. If you want to build one that is a kit then the SIG Hog Bipe is the one. Again real predictable.
Now if you really want a bipe that will grow well with you a Carl Goldberg (CG) Ultimate is the cats meow in my opinion. Taking all of the excellent advice that has already been given and applying it, this bipe is probably one of the best out there. Actually any of the Ultimates are great except for the 40 size if you can even find them anymore. The 40 sizes are somewhat twicthy.
The CG Ultimate on low rates is as docile as they come. Crank up the throws and it becomes one of the wildest planes out there, but it's still really predictable. Landing this plane is extremely easy as long as you keep a touch of power on until just about a foot off of the runway.
One of the best setups for the CG is the YS110 turning a 16X6 APC prop and Hitech 5645-MG servos all around. That's what I had in mine. The servos were overkill but I like lots of torque on my servos. All I can say is holy cow. I did the stupid thing and sold mine but I just ordered the Wildhare Ultimate that is coming out in April that runs on 50cc gas using the same servos I used in the CG Ultimate
I have seen the CG Ultimate flown with OS120 Surpass engtines and Saito 120 up through the 180 and all fly it well
Here is a link that has a few pics of the Wildhare Ultimate...Can't wait I now see relief for my biplane withdrawl symptoms [&:]
http://www.rcuniverse.com/forum/Utli...2720071/tm.htm