A lot of fine boats mentioned! I would suggest you look at the Independence 31 (Ericson 31C). Classic
shape with beautiful reverse stern and out hung rudder
lines and easily driven mod keel
rig on a 11-12K lb boat
. A lot of them available if you look and in incredible shape occasionally. I had her bigger sister the Ericson
36C and loved it. Much roomier than the 31C and sailed about the same.
Wylie built a west system double ender of 31 feet that was an ultralight of the day and fast. That would be my other choice for 31 feet. I have wet dreams about that boat.