If you are bringing payment into Canada and it is more than $10,000.00 you have to declare it at the Canadian border.
Contact US customs as to what they require. It's not difficult. I believe you will be assessed duty, something along the lines of 2% but if so it is minimal.
I believe you have to prove the unit is free of debts/liens.
Go to this US Customs website which should answer all your questions as when I googled this here's what it came up with:
CBP.gov - home page
US Customs ServiceAnswers all questions about importing INTO the United States.
good luck with your purchase.