My thoughts are that the 5.8 in the link is at a pretty attractive price. However that is a pretty old boat 83-84? Its probably a solid glass model. It's mast would appear to be raked crazy far forward, see if you can test drive it. Its also NOT a 5.8NA that you may read about online.

How much wind are we talking about on average?

I'm thinking the 5.8 would be a handful solo, in breeze and especially on the beach.