I've had good luck w/ the Window king, they are in the bronx and gave me what I felt was an awesome price for some nice windows. I was specifically looking for Okna windows, there was another place near Bayside that also sold them, but gave me a much higher price than the window king.
I wouldn't put much faith in Home Depot or Lowes though, I joined Angie's list and it's actually worth the price for the amount of real reviews you actually get. You can also sign up for a month and then cancel, lots of contractors to pick from there