Rubirosa is a popular, pizza-heavy eatery on downtown Manhattan's Nolita neighborhood. I have been to Rubirosa for some packed-house, long-wait dinners, and have recently been back for a few much calmer (and still delicious) lunches. On my most recent trip, I split with a friend both a pizza and the side of broccoli rabe - a great and affordable vegetarian lunch.
The arugula pizza was great - crisp crust, and lots of beautiful flavors from the salty cheese and sweeter balsamic and onions.
The broccoli rabe was also cooked well (not tough as rabe can be) and well salted and seasoned with garlic.
So definitely consider checking out Rubirosa when it is a much calmer place during lunch time - and bring a friend to make it one of the better, affordable sit-down lunch options in an otherwise pricey area.
235 Mulberry Street (btwn. Prince and Spring Streets)
Nolita/SoHo
Easily accessible via the B/D/F/M at Broadway/Lafayette, the 6 train at Spring, or the N/Q/R at Prince.