I had a Centurion Le Mans (ended up being too small), a lower end model compared to the Ironman, and it was a really nice ride. I'm not a huge fan of Biopace, but that's just a personal preferance. As for the price, Portland is just as bike crazy as SF so actually for that part of the country it seems fair. It would sell for about the same here in San Francisco. It just depends on where you live. For example, I saw the same frame in SoCal a couple of weeks ago for $50 or obo.

If you change your mind and go ebay, just keep yr eye on shipping costs and make sure you negotiate it up front.