Just a personal update...
From personal experience, there is no duty, only tax, applicable to electronics coming into Canada. I have bought an 811 receiver and had Sirius long before they were in Canada. Be prepared to go through an extreme hassle to get a Dish net receiver activated. They will want a US social security number ( something unheard of being asked in the Great white north due to privacy concerns) but once you are setup go for electronic billing on their web site and pay online. I have a Vonage account with a Tampa virtual number (where my sister in law lives) and use her address. I have not had the need to call them in a long time but the number is still active. Any mail sent out I get forwarded to me anyways.
Good Luck
Satboyz