Bro,
the best guide is at
http://www.utopiaguide.com
It's the New York equivalent of Sammyboy.
The other option is to go down to JASMart and pick up a copy of tocotoco, the free Japanese newspaper. In the back there are ads for escort services -- some of them are Korean places based in Manhattan.
Just remember -- if you want to cheong Asian go to Queens or Chinatown. Cheapest and best quality. Asians based elsewhere are usually over-priced and not that hot. My 2 cents.
I don't miss cheonging in New York, except for the one time I got a Singaporean girl who had the tightest cunt I've ever fucked. She was working on her back to pay for her vacation.