Well, I certainly wouldn't pay over $1000 for that one, as you don't know if it's complete or not (never assembled? where are the rest of the parts, or are any missing? that kind of thing).
You can get a brand new 4-post 7000 lb lift for under $1800...
http://www.derekweaver.com/update/TX...uct.aspx?id=39
(that's just a quick Google, I'm sure there are some in your area).
Craigslist is a good place to find them, I know of several 2-post lifts around here for $1000 or less...