On this stretch of Madison Avenue, money talks. And at Nello, where suave waiters pamper Upper East Side princesses, a 20-dollar bill says, “I’d like the appetizer salad of arugula, pears and fontina cheese, please.” The similarly fresh and tasty tuna tartare (one of a good selection of antipasti, like chicken livers and grilled sea scallops) will set you back $25. Hefty portions of traditionally cooked meats and seafood run upward from there, as do the exquisitely prepared pastas. Maybe you should just whip out the plastic and let it do the talking.