It's probably not too much - I usually go on one or two international trips (for fun) a year. I've never had to do international business travel, and don't see it coming up any time soon. So probably in the neighborhood of $3000/yr international.

I like my SPG Amex (though I don't like that they raised the annual fee from $30 to $45). I'm starting a new job soon, which will involve a fair amount of domestic travel, though I think I'll get an Amex corporate card for that. TBD.

I've always had the Chase UA Visa (initially the standard one, then upgraded to the Platinum one last year before cancelling it when I moved to NY). Then I moved back to Chicago, and here we are. I hate UA, but my miles and status are with them, so here I am.