We tried R. Sietsema's recommendations, Mexico Dos (1726 Amsterdam Ave.) and New Caporal Fried Chicken (3772 Broadway).
New Caporal, a personable dive (takeout only) has a bulletproof window and good, greasy, and cheap chicken (3 pieces and fries were $3). The service was friendly as promised, the chicken fine. But since cholesterol is high we won't be able to visit often. I don't think it's worth a special trip (we already live in an area filled with fried chicken places), but it's nice to know there's a better place than McD's on 155.
The tacos at Mexico Dos restaurant were all tasty, and fairly priced at $2 each. We tried the chicken, vegetarian, and cheese. The cheese was unremarkable, though it was enlivened by cilantro, the chicken shredded and mildly spiced, and the vegetarian was far more interesting than the ones sold at 6th Ave and 23rd (lots of mushrooms and spices). Their tamales sound good, and we should have tried their moles as suggested. Instead, we ordered the Pipian con Pollo ("tungy sauce made with pumpkin seeds and herbs"). For $8, all we got was a chicken leg and thigh in a hot but boring green sauce--a really poor value for the money, especially in this neighborhood. We would be willing to give the place another try for more "snack food" kinds of items.