The Alberg 30 Sailboat : Bluewaterboats.org
They are pretty boats. There is a lot of info on them, including this site. Not much tankage and space.
Although not technically a "blue water boat", you can get a Hunter 33 Cherubini for less than 15K, complete with shower.
And yes, we are all completely insane. I am down to eating oatmeal and sandwiches every day, just to support this habit.