Hamachi [34 East 20th Street, New York; Menu]
Perhaps overshadowed by its neighbors like Mizu Sushi, this is somewhat of a hidden gem. Solid sushi and surprisingly easy to reserve for large parties (think dinner for 10-12 people). The specialty rolls are where it's at, even if they are a little pricey. The Deep Impact Roll was particularly good and the Blue Monkey Roll was also delicious. Beware of the fried, rather than steamed, Gyoza.