Gantz, your in NYC? I'm in NYC. I go to Renzo's. Very nice school. Level of Jiu Jitsu player there is ultra high, tough guys all around. Very nice though. Its not so much a place of instruction as it is a gym. But hang around a bit, and you'll dig it. I've been to Machado reps and Judo dojos, but I ended up coming back to Renzo's because I felt the place was great enough. They also have a boxing and Thai boxing coach. I haven't worked with them, but plan to in the future.
If you want something different, you might want to check out David Bond Chan. He teaches internal martial arts. I trained with him for two years, and he knows his shit like no other. Best hands I've ever seen. I didn't like most of the students there, and its a very traditional atmosphere, but Chan is unique as far as traditional people go. Chan spent 8 years in Gleasons gym, and he'll throw down with anyone. Mans power is immense, and I credit with him to opening my eyes to reality in martial arts in general. He really taught me allot about boxing, and internal arts. Great, great teacher if your interested in striking and body mechanics. He can teach you how to generate power, defend, and punch very hard and clean. His internal exercies are great for your health too. He's also great with weapons too, he took on another sword teacher a few months back and the guy had a stick made out of heavy wood. Not a light bamboo shinai like Chan used. Chan still beat his ass.
No bullshit forms, just show me mentality. His martial arts keep me alive in the clinch, and allow me to get my sprawls off as well help me try and balance out fighting a taller man in striking. Conditoning isn't stressed there, so you'll have to do it on your own. He's just a teacher, and you won't get nearly the workout there (although it can be tough) that you would at other places. Also, some of the students are delusional...and Chan can be stubborn at times, although I really respect him and he gets my hearty recommendation.
Oishi's Judo is said to be off the hook if your interested in Judo. If I didn't have Renzo's, I'd go to Oishi's. Its a tad expensive, but so is Renzos and in this city you get what you pay for. I went there and the conditoning drills they did were insane. Tough club, no doubt.
Biwako Judo dojo is hella cheap, but the quality of player there isn't very high and they have kids running alla round. Still, its a place to learn Judo and you get some guys who are VERY good who like to train there to suppliment there other schools time.
Good luck.