Okay, hubby said that he hasn't heard much about Nitro, but that he knows good things about St.Albans Windows. Also, his cousin has a business installing siding and windows, his name is Austin Stephens and his business is in the phone book. If you call him make sure you tell him that his cousin Tim Stephens told you that he would give you a good deal, if you do this then he will install his windows at cost and labor.
Good luck,
Nancy