I have the opportunity to purchase a mint 1990 Trek 520 with description as follows:

"Its in great shape. I picked it up around a year ago with my Schwinn Voyageur. The guy bought it for his wife and the went on one mini tour then it sat in the garage. It will need new tires since Im guessing there dry, But other than that its mint."

I've been considering picking up a Surly Cross Check frame and moving over my 2002 KHS Flite 300 components to have as a solid all around bicycle. I'd like to get into some more long distance riding as well.

Considering all of this, what would you pay for a mint 1990 Trek 520? He wants $525.