Hmm okay here are my thoughts. I too have the shadows (Just recieved 'em today) and they come standard with a pair of brushed aluminum plates. In my opinion if you want the shadows to look the best, and the design to stand out the most you should stick with black coloured shields. Unless you want another pair of brushed aluminum ones (they don't look that great engraved), you are choosing between the shiny black and matte black shields. Now I have both of those colours of shields, and I can tell you that although the shiny black ones look the most sleek with the rest of the headphones, the matte blacks look the best with the engravings, and the little bit of contrast they give the shadows looks very cool. So if I were you, I would get the matte black ones, but before you order, make sure you look at some pictures of different engraved shields and see for yourself which ones look the best to you.
PS: You may already know, but the pictures are almost always not a perfect representation of what the colours/textures will be like in real life, but they do give you an idea of the differences.
Edited by letmelivedeep - 3/10/14 at 9:04pm