The Albin Vega
suggestion would def fit the bill on a budget
. Otherewise, here's the obligatory link to a great small bluewater boat list: atomvoyages.com/planning/good-old-boats-list.html
There's probably someone out there who's circumnavigated in a Hunter
23, but it seems to me the seamanship would have to make up for the boat's shortcomings, as well as basically re-building all the boat's major systems as already mentioned. Don't underestimate the cost and time associated with a major refit
of even a small boat.
Only other thing I got..I was new to sailing a few years back and have managed to find plenty of adventure (and time spent refitting) without having to look very hard.
The standard analogy is that boat's are like tools..find, make or refit
the right one for the job.