Food for thought. A small cuddy may give some privacy when nature calls. You have to earn a name like "Bobby Brown", so I'm no stranger to the red ring of shame...but your wife might appreciate a bit more couth in that instance.
If you dont think that will be a problem, there are a TON of boats out there. Newer engine with low hours, and they can hook it up to a dyno machine to see how it was run.
Good luck in your search and let us know how you make out.