1) Most of the interesting restaurants to me are only available for lunch Mon-Fri - e.g. A Voce, Aureole, etc.
2) This week is difficult to get reservations at any of these places for lunch. I remember they used to be booked 3 weeks in advance.
3) The restaurant week menu is usually not a great representation of the real restaurant. They gotta make money, so you might be getting second grade stuff.
4) There are great deals available all year round - you just gotta look for them.
-Jean Georges - lunch menu same as the dinner menu, 2 courses $28
-Nougatine (connected to Jean Georges) - 3 course lunch $24
-Sushi Yasuda - $21 pre-fixe dinner
If I had to recommend "restaurant week" places for dinner, here they are based on places I want to try or places I've been...
- Anthos (Greek)
- Alfama (Portugese)
- Aquavit Cafe (Scandanavian)
- Chinatown Brasserie (Chinese)
- Compass (New American)
- En Japanese Brasserie (Japanese - decent place, but cheap enough where you don't need a deal)
- I Trulli (Italian)
- Mai House (Vietnamese)
- Megu (Japanese)
- Payard (French)
- Perry Street (New American)