As I mentioned in another post a '91 model with 3,300 miles is being sold around here and the seller is asking 2500. The carbs were cleaned, but other than that the tires are old, hoses were not changed, not sure about the valves. I figure it needs a few hunderd bucks to bring it up to retail shape. Which is 1740 according to kbb.
I bought mine with 30,000 kms for about $2,000 US 3+ years ago... it came with a yosh exhast and a jet kit -- oh, and dirty carbs, finished o-rings rusty tank, rashed right engine cover, mangled front rotor, finished front tire, leaky fork seals, and a dented tank. Yeah, I probably got robbed, mine needed tones of work. All that said -- I still love it. Runs like a champ now.
If you can get that bike for $1750 US I'd grab it... usually good stuff goes for more then the KBB value. I'm not sure what the exchange is right now, but in Canada you can't buy a decent bike for less then $2,000 cdn...