Got the same dilemma. The issue I have is the middle support which doesn't look ideal and is more prominent when it is painted in a light colour, so I'm thinking matt black at this point.
There does seem to be some variation in the position of the middle in some of the photos where they appear to be set back further and therefore less visible.
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Current
F30 335d, Mini JCW
Gone
E91 325d, E90 320d, E92 M3, E87 118d, X5 30d, Z4M coupe, Z4M roadster, Mini JCW, E36 328i sport, E30 318i, Mini Cooper 35.