I think silver is passe. Everyone in the world has a silver Honda or a silver compact GM SUV now.
How about black plus a distinctive / tasteful colour that is just different enough to be noticed -- maybe Burgundy or British Racing Green.
EDIT -- not sure I understand why the crossovers would need to be taken out in order to support non-computer inputs. Is that just to get the price point down enough for the market ? Isn't the need for crossovers a function of the speakers you hook up, not the input source ?