Thanks, everybody, for your suggestions. I had a long talk with the founder and CEO of the company - and who did my quote for the Wincore windows. I have a better understanding of the value of the windows and what we'll be getting for our money. After recalculating for 13 windows instead of 9 (I was not counting the twin hung windows as 2), the numbers make better sense. $475 per window falls in the middle of the averages I've found online. These are their best/upgraded windows of their 5400 series. I have a good gut feeling about the company the people I've dealt with so far and we're going to go with them. I've been assured that we will be 110% satisfied... so we'll see. I'll be very anxious to see how the new windows will affect our cooling bill this summer here in the frying pan that is Houston!! Thanks again, everybody. I'll be sure to post here after the job is done.