We own a Lancer 25. 30" draft, sleeps 5, sails well enough. We bought the boat for $2200 in good condition, and after some repairs and modification, the trailer cost about $1500. (American). We launch anyplace we feel like it with no tongue extension, but it can be a little interesting at times.
Allow me to impose my opinion. Pick up a copy of The Complete Trailer Sailor by Brian Gilbert, or something akin to it. Gilbert provides all sorts of information on sailing, trailering and seamanship. He also has photos, drawings and specs on 50 or so trailerable boats from 16' to 26'. It can help you decide what you like, don't like or need. One thing he won't mention is the head. IMHO, get a boat with an enclosed head. Many people don't care for sitting on a port-potti in the middle of the cabin floor, as many of the smaller boats are set up. Just a suggestion.
At any rate . . . welcome to the flotilla!