First of all, in terms of multihulls, you need to decide whether you want a catamaran or a trimaran.

Personally, I prefer catamarans because they have a lot more usable interior space vis-a-vis the length of the boat. Smaller boat means lower costs for a lot of things, like sails, rigging, and dockage.

Catamarans are more open and spacious-feeling inside, and you don't have to walk DOWN into the main hull as you do with a trimaran.

On the other hand, a trimaran usually has more exterior deck space because the overall boat is wider.

Also, I would get a production-built boat as opposed to a home-built boat. And fiberglass as opposed to glass over wood.

A good website to find owners to talk to about various types of cruising multihulls is the Chesapeake Multihull Association, http://www.chesapeakemultihulls.org/