Originally Posted by
abdon
On average, a used bike is not worth as much as the owner thinks, but more than the buyer thinks
Google and ebay are your friends. Watch the auctions for a while and you'll get a reasonable range. Right now there is a '08 model full campagnolo drivetrain with a $4k buy now.
You may also consider a trade-down; somebody may be willing to do a trade plus cash.
Listen to him, you could end up getting a great deal this way. Maybe a less expensive bike, but with some more accessories? or cash, like he said? Maybe place an ad, stating you're willing to listen to reasonable trade offers?