Get a GK24! I bought one last year and love it. They sail really well, have loads of room down below (provided you don't want standing headroom), seem to be well built, and perhaps most importantly, are fairly inexpensive for what you get.
I'd definately go for one with an inboard, and the fractional rigs much nicer to handle than the masthead version- no large headsail to stuggle with, a nicely balanced sail plan that sails well under either sail on its own, and the sails are small enough that you rarely need to use the winch for sheeting in the genoa.
