I'd say only black or get black and bordeaux or brown but not both. They look too similar to justify them all unless the money is not an issue. Bordeaux is not common so it is tempting to keep as a collectible if you are into collecting Chanel but otherwise I wouldn't get both.
I saw the brown GST at the boutique and it was so close in color to the black that I wasn't as interested. But the bordeaux...it's so pretty and it's such a unique color. If you do end up returning it, would you mind letting me know where you return it to so that I can buy it?