$80k for a new one seems to be a good deal. My local dealer offered me $72k for my '11 with 14k miles on it (original MSRP was $97,125) on trade for a '13 X5M at $3k over invoice.

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2013 Cayenne GTS Basalt Black/Alcantara (Wife's Daily Driver)
2013 Porsche 911 cab Aqua over pebble and agate (My daily driver)
2010 Porsche GT3RS Black Grey/Black Alcantara (Track car)
2012 Porsche CaymanR Peridot Green with carbon sport buckets (Wife's Track car)