I go through phases with world cuisine, and my tastes tend to run by culture rather than any specific dish. As I'm moving into Greenpoint, I've had Polish food on the brain, though it's summer, and the temperature is too hot and too thick for such food. And even after the temperature dips as the months roll on, I'm not sure it's really my thing.
My girlfriend has mentioned a few times lately one Vietnamese dish or another, so I suspect that might be my next destination.
(I was tempted to answer this with an all-time favorite, the Cuban sandwich, which I order almost any time I see it on a menu. But I'm not entirely sure whether the Cuban sandwiches I've had most often have been Americanized to within an inch of their lives.)
I'd also like to spend a year in England, in part because I'd love to see show after show.