To give you a frame of reference, here's two of mine, one with the stock chromies, one with the new black with polished machined lip....course it was dirty as original and the after also includes a drop, but you can see how the black looks on a silver pt...
Another Before shot:
Full view of it's sexiness after all the work was done...
Now I went black to tie into the look of the rag top, not sure how that will look on a sedan, but if you tint your windows dark, the black throws off very well that you've got it on a silver car...
IMO, you can go either way, that's the good thing about a silver PT, works both ways...oh that didn't come out right..lol...