For a power cord from the wall to your Quintet, the pre-SC version of the Statement is a excellent choice because of the larger gauge and good material. However, it is not so good if used DIRECTLY with audio components.
If you like a power cord that can pass a lot of power and can be used directly with audio components as well, you will need the Statement SC.
Just like to remind you that you need to use GOOD power cords from the Quintet to your components as well to take full advantage of the Quintet. The Pro AC-11 from Harmonic Tech is a best bang for the buck power cord in its price range especially in the used market.