[chumbucket]

Welcome to the site surfdude.
Fair pricing is often subject to regional areas of the country. The same boat here in the Northeast will generally bring a higher price than say, Florida. And even that can be subjective to the area of the given state.
That being said, if everything were to check out okay with the boat, an average price would probably be in the area of about $6500.00
Spider cracking generally is more esthetic than structural, so they're usually a non-issue. Stress cracks can also be a nonissue depending on where and how big they appear. Your main concern should be with the structural issues of the transom, deck and stringers.
Boats that sit on moorings all the time can develop problems in these areas due to water intrusion. Have them checked thoroughly.
For a motor of that age, I would only believe that it had 100 hours or less only with solid documentation. Most people will put 50 - 75 hours with little use during one season.
Without going into every little detail of problems to look for and so forth, read through a lot of the older topics or try the search function. This question comes up quite often. The V20's are solid built boats and do not typically have certain problems only associated with the particular model. Much of the problems you'll find are due to previous owner neglect.
Check it out good. If it works out for you, you'll be one happy boater, then we'll get into more specifics.
Best of luck to you. 8) ;D