I'll add my 2 cents as well.
Pocket Cruiser -single engine(rare exceptions), trailerable, under 28ft.
Express Cruiser - single or twin, sleeps 2 comfortably, up to about 35 ft.
Cruiser - twin engine, sleeps 4 comfortably, over 32 ft.
I almost bought a pocket cruiser a few years ago, but went with a 27ft cuddy instead. I thought the pocket cruiser was too much of a compromise all the way around. I felt an express cruiser would work for my family at the time, but the budget wouldn't allow for it.
With the beating the boat market has taken, I'm giving serious thought to selling everything I have for boating now(pontoon, truck, condo) and buying a full size cruiser. The only debate is now that the family is older, will even a 35 ft cruiser work for the family. I guess the cincy boat show isn't going to help me decide that. I'll still waste a day down there next weekend.