Let me know what you think. I have fond memories of my "little Necchi man" (the dealer in Oklahoma City who was so nice to us).
Oh, and don't forget to take some thread and needles with you. Sometimes people are selling machines and don't have any of these things (especially if they've inherited them). You don't actually need to take cones just several bobbins (I prefer to use different colors when test driving a serger). I'd throw in a pair of tweezers and a needle threader just in case (can you tell my eyes are getting pickier, this used to never be a consideration and I'm not THAT old). :P