I have a 2006 Classic Plus that I bought 6 years ago. It has a 14' frame. I paid little over double that for the machine, all the pantos, 3 footlockers of thread, rulers, stencils, replacement parts (over 100 bobbins and 5 bobbin cases), all her books on LA quilting, a roll of bat. If all you are getting is the machine and frame, then I think that price is a bit high. If you are getting all supplies, etc in addition, then it's not bad.
Not having a stitch regulator would be a no sale for me.
Also, have you ever tried out or taken lessons on a long arm? It is a very different process and sometimes people don't like it. (although I love it!)