RE: What size of RC planes do you like?
I like smaller planes for most of the reasons stated and I have several micro planes that are lots of fun. I enjoy building small foam and balsa planes to experiment with different configurations also.
Having said that, I want to build one IMMA legal plane just to have. I realize it's a lot of work but it really is fun to fly a plane that responds like a real one and you can see it at more than 500 yards.