Hi - new to this forum so please forgive me if this isn't the right place to pose this question. I tried to find the used value of a bike I'm considering and bicycle blue book did not have any pricing for the model I've found. The bike is a 2010 Cannondale CAAD8 with 105 gear set. It looks exactly like the bike pictured below. What would be a fair price range for this bike in good condition? Thanks.