Well, here's a nice one with faked logos and patina for £16000 I'd say that would be the uber-limit for this year/color combo, and there's indications that prices are coming back down.
http://www.thesamba.com/vw/classifieds/detail.php?id=592093
I sold a similar bus but with some floor rust, no motor, hacked wheel wells and no middle seat for $900, and it took a couple months to sell. The middle seat alone in this one would probably fetch you $500 or so. Sans motor, and not knowing the rust status, I'd say you have at $3k - $5k you have some flip-room.
