I just felt the silver was too close to the Storm Ti. I also have Speed Yellow AP Racing calipers, versus your black calipers, so I wanted the black RACs to contrast against them.
The RACs are very light and they have huge clearance for BBKs. My 4-wheel AP Racing BBK cleared the Team Dynamics 1.4 wheels but the RACs have tons of clearance in comparison.
The only things I don't like about the RACs is that they're not as symmetrical as I'd like and I can't use the flush wheel caps. I'll get over it.