Fair Price for Replacement Windows - Georgia

I have received various prices for installation of 6 double hung vinyl replacement windows ranging from $2,200 to $4,500. I realize that the quality, design, warranties, etc. differ from one manufacturer to the next, but what is a reasonable price one can expect to pay? The offer I am considering is $3,300 from Champion (over Sunrise and Simonton 5500). Is this reasonable? Anyone have any thoughts?

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The Infinity from Marvin is averaging 500-700 per opening installed. Six units would be $3000-$4200. For fiberglass, not vinyl. And from Marvin. The additional benefits you should see for yourself. No unsightly tilt pulls and they look like a wood window with no extra glass space absorbed by plastic(vinyl). Full screen and LowE glass are standard. All Marvin fiberglass replacement windows exceed energy star guidelines.