I love my Haida 26. Standing headroom, a functional galley, a nice berth, what more can you ask for? The previous owner lived aboard for seven years and treated her well. 26 is about the minimum size to have a head, hanging locker, standing headroom, and reasonable size berths and galley. Smaller than that and you must compromise one of these things for the others.
I would not go larger than 30'. For a single guy who is trying to get away, it is not worth it. Every foot you add to your boat is a year less cruising in your lifetime...