I just went to apple.com to buy a black leather band for my Space Black Series 2 Apple Watch and... there is no leather band with space black stainless steel hardware. So I'm forever stuck with a black sport band, unless I want to shell out $200-$550 for a milanese or link band.
I bought the Black leather loop to go with my SG AW Sport originally. Now, that I have the SB SS, the black leather loop is my favorite band. I also have the black nylon, a black/gray Nike knock-off and the original black sport. The little bit of chrome on the back of the leather loop is hardly noticeable and in fact, I never even see it until I take the band off. It rests on the far side of my wrist, so all I see is the black leather.