That's really clean. I guess I don't know the market there...I don't think 12.500 is too bad, especially for as rust free as it seems.
Before you buy it though, what do you want to do with it? Dana 35 is a bit of a bummer, as it will need to be strengthened or replaced to run bigger tires. Not a big fan of budget boosts either, but if you're just looking for a cruise around summer vehicle, that can be a nice one!