Salisbury5, congrats on the new car - very nice.
One question, how did you handle the plates in the US vs Canada?
I looked into this earlier this year, but haven't pulled the trigger yet. From what I could gather talking to Canadian Customs, and several others, was that you need a temp plate for each state you plan to travel in when driving the car back to Canada (and apparently each state has different in transit procedures). After crossing into Canada, you can then put your Canadian plate on while going though the registration process. It sounds like this was a non-issue for you, so I'm guessing the dealer gave you some type of temp or in-transit tag/paperwork?
BTW, the car I wanted was an 03/04 Mercedes SL500, but I found the compliance mods could be a hassle. Apparently Mercedes has two different bumper systems for the US and Canadian markets, and the cost of replacing them is in the $5000+ range depending on the specific model. It's too bad they couldn't come up with one system that satisfied both markets.