Who is the best manufacturer of windows and french doors for a new
home. Non custom. Casement windows.  Wood or clad.

hello -
I have been in the building trades for many a year, however I am not a
researcher here. If you are working with a contractor he or she should
be able to direct you to several quality brands that serve your area. 
If price isn't an issue you have the luxury of choices and styles.  I
will leave the listing of specific manufacturers to the folks who earn
their living here.  No doubt that person will need to know where you
are buiding to locate a show room or dealers in your area  (actually
seeing/feeling the products is better than buying online or sight
unseen if you are going for natural woodwowrk or operational
features).
Best of luck to you - synapse666b