I got the same dealership to quote me $40000 Out-The-Door (everything included) for IS350 (yes, Three Fitty) with the same options (NAV+XM). The sticker on it was around $43000, so about $47000 Out-The-Door.
However, when it came to my trade-in value they went a little low, so no deal yet.
Most other dealerships were able to match the price I was quoted once I showed them the email printout.