Some of my favorites:
Burger Joint (Hotel Parker Meridian), Corner Bistro, Donovan's (Woodside), Piper's Kilt (North Bronx), Peter Luger's (lunch menu only), Smith & Wet Wooly, the place on 8th and B'way -- the Astor Place Soup and Burger or something like that.
When you're stoned, nothing beats White Castle; when you're sober, White Castle is just God awful. I strongly believe the chemicals they put in the burgers are made to satisfy whatever craving the THC hallucinogen creates in your brain. Hey, they made a movie about it, which was a 2 hour commercial for WC while getting stoned.