Considering how long you kept your last car, I would stay far away from the Pano roof. I'm sure they have worked out the bugs and lack of UV protection, but it will break and be very expensive down the road.
When your warranty runs out, check these guys out in your area... They rock!
Mercedes-Benz service center: Collie Autoworks-Independent Mercedes Specialists, San Rafael Marin County, CA 94901 (415) 721-7915
The new models will be out soon and the one you are looking for will be heavily discounted since it's not the latest greatest.
Might want to wait a few months??
I see you are in cali... I instantly register CA with canada being so close to the boarder.
California is a great place to buy a used mercedes. The dealers there seem to be pretty HIGH all the time.
Good luck and post a photo when you get her!