I added "everywhere else" and this is how I priced it:
1. I made a list of a bunch of international places (I actually just chose a random city from each continent)
2. I used the "rate finder" on Canada Post (you, of course, would probably use USPS)
3. I took the highest price, and went with that. That way, you absolutely know for sure that you're covered no matter where the order is from.
I always think my "everywhere else" shipping rate seems really high, but I've had orders from Slovenia, Hong Kong, and Australia that I wouldn't have had otherwise.