I would second most of Jeff's excellent post.
Personally, If I had to pick one feature in boat design that can enhance speed and ease of trim to weather, I would suggest a boat with more symmetrical waterlines
, fore 'n' aft.
I have always found that the one saving grace of the IOR hulls (the best designed ones, anyway) was driving them to weather. Next best and very close would be boats with moderate beam and a clean run aft in the hull form like all the descendants of the Cal 40, the Cascades, the Niagara's, and others.
Worst are the fat-and-flat stern boats that bury the bow in a puff and then rise up on one of their fat stern quarters and try to round up.
That design allows room for king sized beds aft, though, and are quite popular for "gracious dockside living."
Happy boat shopping, and fear not -- there's a perfect boat out there for you, somewhere.