We are building a home in the mountains in North Carolina. We need low maintenance windows with a traditional look. Our temps get as low as -15 and we will have some strong winds and humid conditions. We want windows that will last at least 20 years and that will tilt to clean easily. We have considered aluminum clad, high end vinyl and now we are looking at fiberglass. What fiberglass windows are available in our region of the U.S.? Please rate them by price and performance.