Checkout older Seacrafts (20 SF) or Makos in that size.
Two good websites to check out for older project boats.
Classicseacraft.com
or
ClassicMako.com
I have a 1973 20SF that I'll never part with. Not a true offshore boat but very capable. The 23 seacraft would be an excellent choice for offshore if you have a capable tow vehicle.
Good luck!!