If you happen to happen to find yourself in Manhattan, I tried the following cafes last week. Beautiful coffee, latte art, serious expert barista, nice atmosphere. About $3 for a latte/flat white.
Joe - the Art of Coffee
405 West 23rd Street (between 9th & 10th Ave)
and also in Grand Central Station
La Marzocco machine
www.joetheartofcoffee.com
Cafe Grumpy
224 W 20th St (between 7th Ave & 8th Ave)
Synesso Cyncra machine
Both are making coffee of the gods.
Phil