What are the most comfortable cruising boats in 35-50' range?

Hi,

I'm looking for a comfortable cruising boat for myself and wife, and occasional guests.  It should be good for liveaboard for at least a month or two, maybe for the winter season in the south somewhere, then New England the rest of the year.

Looking for something with lots of room, and accessible for a full size poodle, which means stairs, not ladders.  Not interested in fishing or racing, just in floating around and enjoying being on the water, and getting there slowly.

Any recommendations of brands and sizes would be really appreciated.

Fair winds,

Sinbad