I would say beware of retro bikes because of rust. that said damage to cromo frames is fairly easy to spot. the only thing would then be alignment – that's harder to measure obviously but even if the dropouts had been bent you can bend them back a little bit, unlike aluminium which would snap. the other thing is if you are gonna ride it then bits will be a problem. I did have an old klein bike once and I found compatability with new parts a little problem.
It is a defining bike though with its handmade frame. can you get to see it?
lobectomy above me is right – the price is seems to be a sentimental value. if you share this for yeti's then it's a personal thing.
there are a couple of newer klein attitudes on ebay – I'd be wary of buying an aluminium framed bike which is too old.