My friend is selling his F650GS - it's in great shape. I really don't know what the market price is for these bikes but I can testify that he has not been abused or anything - it's like new.
http://sfbay.craigslist.org/pen/mcy/1975002615.html
http://sfbay.craigslist.org/pen/mcy/1975002615.html