There are lots of Canadian Whiskies that aren't available in the US (or in much of it). I haven't had all of them, but these are ones I've heard frequently recommended (and wish I could try).
Alberta Premium (25 or 30 year old if you can find it)
Any special editions of Forty Creek (such as Confederation Oak)
Century 21 Reserve
The go-to website for Canadian Whisky is www.canadianwhisky.org
The old Alberta Premium is fantastic, but I believe they stopped producing it, so the only place you're likely to find it is on a friend's shelf. If you like ryes, Alberta Springs and the regular Alberta Premium are the only 100% rye Canadians I know of. Don't be fooled by Canadians calling it "rye," they call all of their whiskies that, even if they contain almost no rye. Centennial Rye is kind of nice - blended, but has enough rye that you can taste it.
Forty Creek makes pretty good stuff. Their basic label is my favorite basic blended Canadian. I never got the chance to try their higher-end products, but wouldn't hesitate to give them a shot.
But if you're headed for Newfoundland, you should be more concerned about being screeched in. ;)