I would stick with matching the original colors.

Although I prefer the very light greys of the newer v20/21s, the light tan is also a good choice for a deck (stays cool and is easy on the eyes-low reflectivety).

If you switch to grey,for example, it will look great at first, but as time goes on little scratches and chips will reveal the tan. Matching the color will make the inevitable wear and tear much less noticeable.