As an experiment I had some done in black anodize. Slightly darker than Graphite black Cerakote, but should be slightly harder - these will be slightly cheaper than the cerakote option too.
Cerakote in the middle in the pic of three, and on the right in the pic of two. Cerakote has the best chance of matching your factory black chassis (albeit with the normal cerakote batch variation), but the ano should be tougher.