I have aluminum, and I think it looks just fine! In fact, I embraced the red dot with a custom leather band with red stitching, and red hands on the face!
Silver aluminium looks cheap. Get the black or upgrade to the stainless.
That's a rather bleak insinuation, not a fact. And there is no "black" offered in the sport model, it's space gray. The only black that is offered is the space black stainless and regular stainless 316 L.
I like