Old Homestead Steakhouse on 9th Ave between 14th & 15th. It bills itself as the oldest steakhouse in NYC. It's right on the cusp of the meatpacking district and southern Chelsea. One of their sirloin burgers topped with anything is to die for. At $15+ for the burger alone ( no sides or toppings included), it's probably one of the more expensive burgers in NY also.