I've traveled east/west Both in the US and Canada. Though costs are higher, I like Canada better. maybe that's just me..
I was talked out of Alaska in preference to using that time in the Canadian Rockies. I can't tell ya how happy I am about that choice and still feel I went through that region too quickly (spent 3 weeks around there). I will go back and this time spend even more time around there traveling north along the Rockies (east side) and head further into the Northwest Territories.
If you do travel across in mid-Canada, get off the TCH and enjoy what rural Canada has to offer! We split our run with south of the TCH (westward) to north of as we approached Lake Superior. Now that's yet another treat of running both the north/south shores of Lake Superior. Both have their own uniqueness and charm. The UP of Michigan should not be missed, yet... Circle if you can, or you'll have to decide which way to go.
Sounds like a great time! Enjoy! Let's just hope you can go through Canada this time next year...