In my experience, having tested and bought several bikes on Craig's list, there is usually a reason that someone buys a bike and only rides it once, and the bike is rarely in the "mint condition" that the seller claims. In at least two instances, a test ride revealed that the rider was so inexperienced with shifting that they managed to bung up things badly enough that a trip to the bike shop would be required to adjust the derailleurs (possibly even more). and too, the bike shop is just THRILLED when you bring in your craigslist bike to be fixed instead of buying it from them. It doesn't sound like it would be much of a savings for you in the first place, and then you would have to pay to have the first tune up that bikes typically need shortly after purchase (the first tune up is usually free from the shop)
Rodriguez Adventure
Bacchetta Bellandare
HPV Gekko fx
Custom Rodriguez Tandem
2009 Specialized Tricross
2012 Trek Mamba