IF you can find one a New Bombay Trading Company Explorer 44 has the required head room a very large shower and can be single handed fairly comfortably.
I would not want to take it down to the Southern Ocean as the cockpit is large it copes well with rough conditions and is a fast old lady. It is nice to plan passages at 6 knots and expect to do better!
AND yes I do have one. NOT FOR HIRE OR SALE!