I've read conflicting reports on the annual pass restrictions.

Supposedly if you're making two trips to WDW in one year, it is cheaper to get an annual pass.

BUT supposedly you can't have a dining pass with an annual pass, and you have to be a US resident to have an annual pass?

The US resident bit has to be wrong, doesn't it? That just doesn't make any sense to me....

Assuming the dining pass thing is correct, then I think some math is needed to figure out if its cheaper to get an annual pass or two normal passes with dining.