Dealerships are designed to sell bikes both new and used, and they do it well. Well, most of them do anyway. The big advantage to buying from a dealership is that, unlike Craigslist, they have to be accountable for their actions. That dealership is probably still going to be there when you come back, so if the bike they sold you doesn't live up to what they said it would, you can come back and give them an ear full. If you want to come back and get a few more parts to hop up your bike, they'll probably recognize that you got it there from them and try to hook it up. While some dealers can be slimeballs, most of them are good about not taking advantage of new riders and aim to get more people on the road-- rather than just focusing on more money in their pockets right that second. If you feel you're getting the 'hard sell,' or something pushed on you that isn't quite right, you're always free to leave and probably should; there are plenty of honest dealers out there that will take good care of you.