Black for sure! I think it would look gorgeous with your black hair...and you can wear it during the night and day.
The champagne is a nice colour but would be hard to match with clothes.
i'm asian as well, and i'd say champagne would look super classy...but black would be more practical b/c it wouldn't get dirty as easily.
if it were me, i'd get the black b/c i'd kick myself for getting the champagne dirty. i guess the other thing to consider is when you plan to use it - everyday or for special occasions? If it's for special occasions I'd definitely say champagne.
I vote for champagne. The contrast will be worth the extra effort to keep it clean (and I presume it can be dry cleaned?), whereas the black will blend in with your hair/outfits. And the champagne is beautiful!