I bet it's legit.
Probably found this site, posted it for sale, then got slammed with PM's and people posting things like "how is this still for sale???" and "Great price".
Decided to raise his price and throw it on Craigslist. I really don't see anything too suspicious here.
If you're interested, just set up a time to go see it in person. Never send anyone cash that you don't know very well and trust.