Little high...
That seems a little pricey for a used 20-39 PCi. I purchased mine last Aug. and with shipping from OH to GA, the total was $629. If it truly is only 2 years old, I'm not sure if it would have the newer drivers or not. Considering the owner isn't shipping, you should be able to get it for less.
For a $130 difference, I would purchase a new one and considering 70% of my equipment is used, that should tell you my mind-set on buying used and new... -TD