My sale with my friend fell through and I decided to just hold onto the car. I was offered 75-80k from several parties several months ago....
Well,
I can tell you that I paid $70k for my 05 LBBP that was right under 21K in July 2013. When I was really considering stopping my build, I check Blue Book and the car was valued at about $74k a little over a month ago, so the prices these guys are giving you are pretty damn accurate. At the time of purchase, the t-belt and other stuff had not been done, so I dropped another $3k'ish getting her back up to date with service requirements.
Good luck in your search!