If you're going to go used, just be patient. Depending on where you live, the motorcycle "season" may be nearing an end with school and college starting back. And that could work for you, or against you. I searched Craigslist, and searched in 4 markets in two states. Wound up driving 100 miles to pick it up. But if you buy one still in factory warranty, then the warranty will go with the bike, not stay with the original owner.
I wouldn't worry as much about it being dropped because that's pretty easy to see. Lots of telltale signs that most won't try to hide. I've found most owners to be pretty honest about the stuff you could see. Now....how was it broken in, has the oil been changed? Those are tougher things to figure out.