Police Car Markings

I've ordered a number of 1/50 scale cars from a supplier in China... more on them when they arrive.

This has got me thinking about how to paint them. I have decided on the following:

1. Traditional American black and white scheme, specifically one in which the pillars are NOT painted white, only the door panels and possibly the roof are.
2. Generic markings. I've gone back and forth on this. Basically, it comes down to the fact that I don't have the room to store cars in various livery; thus generic "metropolitan" police markings will be used.

Design A

I have yet to decide on the exact design of the door markings, if a shield/star or patch will be included or not... my initial pen and ink sketch yielded the first "METRO POLICE" design (above), and I rather like the balance of it, however, I do think it's probably more appropriate for "police" to be printed larger than "metro." thus the two other designs.

Design B

Design C

Thoughts?