"Todd H." wrote

Get more quotes. I got some Alside windows that I dearly miss at
about $350 installed a piece--I think we did 12 of them. They weren't
as long as your windows, but a similar quote was given to me at my new
place which has these longer windows.

I agree Alside manufactures a decent window. And, they've been around for a
long time. I do know they back their products.

The OP should be able to get a better product and much better price, for
the size of the openings.