I have black grills on my QS8s -- if I was buying again I would go with the most unobtrusive grills possible (gold, tan, whatever) for tops and fronts. You want to notice the mains... but the room seems to look better if the surrounds fade into the background...

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8