I'd buy new if it was me. Actually, I did buy a new one about 1 year ago. Bought the same miller your looking at, off eBay. Free shipping, and if comes with everything the person on craigslist is offering except for the argon tank (which you can get I believe for about $80 from a local place.) The one on eBay is about 80 bucks more than that of the one of craigslist. Just my 2 cents, I'd buy a new one. Here's the link:

http://cgi.ebay.com/MILLERMATIC-175-...QQcmdZViewItem