As for packing up and moving to Canada right after the wedding, I DO NOT recommend this. I am in the process of being sponsored at the moment as a "spouse". I have made over 12 trips this past year to visit my husband in Canada and was always given a 6-month visitor visa. However, on this trip I just made, I was only given an 8-day visitor visa because the officer suspected that maybe I would not leave Canada (even though I had a return ticket for one week later). If you move to Canada and you decide to go to the USA to visit, and you give up your house and everything down there, if you get a short visa because of this suspicion, you will be screwed. I recommend sending the paperwork immediately after the wedding and staying in the USA till you get your PR card.
Many people forget that just because you CAN get a 6-month visitor visa, doesn't mean that you WILL or are entitled to one. Do you want to risk having to constantly get on and off of planes for the entire process?