I don't have a Pfaff, but my sister has one (not the model you are looking at). The one thing that aggravates me about her machine is the location of the presser foot lifter. It is to the right of the needle, under the arm, and I am used to machines with the presser lift behind the needle.
Found this list of completed purchases on eBay, which should give you an idea of pricing:
http://www.ebay.com/csc/i.html?_saca...mplete=1&rt=nc