Metropolitan Optical caters to the urban-hip crowd. With brands like Vera Wang, Versace, Gucci, Kenneth Cole, and Donna Karen, the frames and shades aren't cheap, but they look good.
Their online website (http://www.metropolitanoptical.com/index.htm) does offer a $40.00 off coupon for a complete set of glasses, which helps the price. Be sure to print it before you go as they don't honor it post-purchase. The staff was courteous though not overly interested, and the store offers quantities limited by its space.
Metropolitan Optical accepts Gworld cards for GWU students' ease, and is within walking distance of that campus.