Wow. Dealer offered me $32k as a preliminary offer, so maybe I should just take it if that's above auction pricing. I'm not upside-down on it, but I still owe about 22k so the better the price, the lower I can make my payments on the M2.
Checking around Autotrader and looking at what they are listed for (both dealer and private sales), pricing is kind of all over the place. A bunch of them are in the lower 40s, some with more mileage than me and some with less, and pricing seems to be as low as 39k and as high as 49k... there's one guy dragging the market down with a ~8000 mile car only asking $39k too.
If I put mine up it looks like I will be the only Sepang car on sale though, which I have to imagine helps my cause... If I can get 35k privately I've (barely) beaten the dealership offer (even with the trade-in tax advantage).