Okna Vs Anderson . The most expensive model of the atrium window. I'm an engineer and did lots of spec research on the available options in vinyl and fiberglass. Lesena in alu okna Marles from www.marles.com Andersen 200 series windows are the company’s value line of wood windows. Cottage/oriel windows typically add $40 to the cost whether aw400 or okna. Prior to ply gem, silver line was used to owning by andersen.