HELP!! Any Recommendations for Northern Virginia or DC Metro

Hi. I'm new to this board. I'm currently shopping to replace 5 windows. Two (2) sliders at 58 X 21; 2 windows at 29 X 21, and 1 window at 44 X 21. So far I've gotten an estimate from Pepco and a home improvements contractor. My estimates range from $2400 to $2695. Are these estimates reasonable? The windows for the home improvements contractor was Certainteed Brynmawr II. I believe Pepco uses Vytex Windows or Vinyl Technologies, Inc.

I don't have a clue as to what's good, and what isn't. Can anyone recommend a company or brand that they were happy with? Thanks for your help.

21" is very short are you sure they arent 21X 58?
Assuming all your measurements are correct the best I could do with PPG solar ban 60 low E glass with argon and a glass breakage warranty is $2200. Their bid is well within reason . Depending on where you live. (And how much you want to spend) You could pay as much as $4000 and get no better and no less.