I have to agree with another post, you should try the Yahoo group "SewItsForSale" - I've seen several longarms sell surprisingly fast on that group. I would keep the longarm set up at first, in case the buyer wants to "see it run".
And I have to agree with some of the other comments, don't EVER "meet"someone alone.
Trust your instincts, if something seems fishy or a little weird, don't deal with that person.
With that said, I've had some success with purchases from Craigslist - I've never sold anything there though.
However, I HAVE sold several batches of fabrics on SewItsForSale - no problems with the buyers, and no hassle with getting my asking price.