Gotta tell us what type of planes YOU like and what type of flying YOU aspire to do. 3D aerobatics, scale Aerobatics, Warbirds, Bi-Planes, Golden Age. You will find the bulk of any one fliers efforts are in one of these categories.

As far as size goes. Again, it's relative. What are you used to seeing at YOUR field? To some people a .40 size is a huge plane to others it's entry level. Even still some .40 sized cubs have the same wingspan as a 40 cc warbird. For you, does size equate to wingspan or engine displacement?

IMHO, there are plenty of capable and likeable planes in the .40 size range (engine displacement). There seems to be a great deal of manufacturer focus in this size as opposed to any other. You have more choices here.

A close second is the giant scale class (IMAA legal classes). That is, 80" wingspans and/or 1/5 scales. Great choices here also.