Andersen makes a fibrex window (wood pulp mix), not a true fiberglass window. What type of house are you building? Where are you building? What do you want the windows to look like? What style window? Budget? Tract or developers house? What are your other choices as there may be better alternatives (either fiberglass or a better vinyl)?

Where is the home located? Climate and performance specifications should weight into the decision criteria about as much as aesthetics for the materials selection.