We're looking at replacing a large arched top picture window. About 65 inches wide by 76 inches tall. Would like a wood framed window, triple glazed, since all the other windows on the main floor of our house are wooden sash windows. We're having trouble finding a manufacturer that deals in this size of window. Everyone wants to break up the space and make it a three piece unit. We like it like it is, one open window. We just want energy efficiency. We've looked at Pella and Marvin. Any ideas?