$50,000 to $100,000 seems to me to be a pretty big spread for a budget?
$60,000 +- should find you a nice T37C in above average condition. That said, you would likely still need/want to upgrade and replace several things, your left over $'s should take care of that
Of course a good survey, but some specific things to inspect well would be: the cored hull, centerboard, hull to deck joint, rudder post.
We love our boat, but there are many other boats you should look at that may fit your needs better, they may just not look as good