+1 for Whiteface, Gore and Jiminy. And Pkill with enough snow will groom the long steep black run under the double chair (looker's left, skier's right).
Honestly though for consistent thigh burning groomed steeps with easy access from NYC, Jiminy is the winner. If you ride the single line on the six-pack or if they run the Whitetail quad, you can rack up a ton of high speed steep shots in a very short time on Whitetail/Jericho/Exhibition and Wild Turkey. You can also go braindead doing same, which is why if time permits Whiteface or Gore are well worth the trip, and same for Plattekill if conditions permit.
PS, never skied Stowe or Sugarloaf but Sugarbush would please you as well. In addition to Organgrinder and others on Lincoln, the Upper FIS run on Mt Ellen is a good steep one.
Don't take our word for it though, see www.3dskimaps.com