Aside from those mentioned, I always thought that the three piece dash trim should be CF as standard and the top of the dash / instrument panel should be clothed in alcantara like the steering wheel rather than the standard plastic finish.
Better brakes, roll cage & dip stick seem popular choices.
Colour - I only mentioned a sold black, rather than metallic black, for it can look stunning e.g. E30 M3 Sport Evo.
The number of times of times Black or silver comes up is amazing, and in my times with the E30 (except perhaps diamond black) or the E9 the issue almost never came up with the colour choices.
And yet as the car gets older, I expect the colour will not matter.
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