Listen to cisco, he has good eye for this sort of a thing.
Believe me, you do not want an outboard motor!
Have you ever sailed single handed in a gale when you needed your engine? Or crossing a bar? The outboards propeller would be bobbing in and out of the water like jack-in-the-box reviving up then catching water again destroying itself in the process. Seen it happen.
A good reliable diesel with folding prop is my recommendation.
The keel is the other thing. A folkboat or similar with full keel is nice and classic but slow, very hard to manoeuvre in closed marinas and very bouncy in rough seas.
The first thing l look at on sea boat is the size of the scuppers compared to the size of the cockpit. Small scupper drain v e r y slowly.
Whatever you end up buying you going to spend on it ten grand plus easy. Just think of the safety gear sails
and comforts.
You must have quality harness-life west and plb, jack lines, new lifelines, e-epirb the best available, set of spare sails, storm sails specially on a slow yacht! This is only scratching the surface...and the list goes on and on and...
I bet my yacht on it, those advertised tubs do not gave anything near the required gear.
Most ads come with old old photos too. They were like it ten or twenty years ago!