Personally the black or silver I think look good. White - seems out of place to me. This is a quick photo edit. May not be the stripe you mean, but it should give you an idea.
As far as my comments go, is your car a daily driver or garage kept? If it is not a daily driver, the silver will last way past the expected life. Vinyl manufacturers rate their materials based on a sign that is outside 24/7/365. Less UV exposure = longer life
For your car...I think the white graphic stripes would be awesome. Maybe do something creative like 2 thick 10" stripes with some 1/4" accent stripes surrounding them.
Stripe or not depends massively on the color of the car. I think that the color-vinyl roof combination of your Dart doesn't work with a stripe very well. White would be the better choice if you look at the color, but in combination with a black vinyl roof it wouldn't match, as I think. A black stripe is too dark for this green, because the contrast would be too little with the black stripe. So I wouldn't put a stripe kit on the car, if not original.
I have also been thinking of putting a stripe on my green Dart, but I faced nearly the same "trouble", although the green of my Dart is not as dark as yours and my vinyl roof is green.
Here are two pics of my Dart for example(different tyres and rims):