Size limits are to what is trailer-able. Budget should be limited to around $10K used. ...
The only one I know that comes close to that price (new) is the Varianta 18.
Varianta Segelyachten - from Dehler with love
It is made by Dehler, now Hanse group and is sold exclusively by internet.
It is a fast and amusing boat that has made a big success in Europe for its Price/Performance.
I don't know if Hanse is going to import it for the States.