Soft-lite, Okna or Sunrise would all be solid choices in vinyl and Marvin for fiberglass or clad wood.

@Ultra Windows thanks i will try to find some local dealers and start with these brands

Id try to match the look and style and mounting of the windows to match the rest of the house, I hate it when additions look like additions . Tou may run into problems when looking for

the windows Ultra mentioned unless you are preparred to add another contractor to the mix. The Okna, Soft-Lite and Sunrise are typically sold as installled only by select dealers, Marvin

can be had by almost anyone, except the big box stores. Stay away from Pella, Silverline,American Crafsmen, Jeld-Wen, Windsor, any low grade/entry level vinyl window. Some of Andersens products are nice. It’ll probaly be hard to find a good wuality standard sized window since box stores are the only ones that seem to have these and the qualty is typically not there and the sizes will not usually look right in an addition. It would be good to know what your builder has access to and what they think would best integrate with the rest of the house.