I like the PlyGem 1500 single hung series vinyl. They are double glazed/Low E, ect.
They are 16 or so weeks out from order date ATM.
The have basically doubled in price in the past year.
I was paying $158 for a 3060(3' wide/6' tall). I ordered 10 of them for my shop and they are now $308 each.
A more common size is a 3050 or a 28(2'-8")50. They are a little cheaper.
The rough opening on a PLYGem 1500 is the call size.
A 3060 has a 36"x72" rough opening.
Get prices from at least 3 supply houses/lumber companies. They will vary by $10-$20 per window.