El Paso Taqueria [1642 Lexington Avenue, New York; Menu]
Head to the Upper Upper East Side for some delicious guacamole and tacos at reasonable prices. Throw in a mango margarita and you'll have the full experience. I had three tacos, one each of chicken, beef, and pork and was pretty full afterwards for just $8. Although I normally prefer pork tacos, I would say that the beef (Bistec) was my favorite one here. Of course, El Paso also offers all the other classic Mexican dishes and the Burrito de Hongos (mushrooms) is a solid vegetarian option.