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If you didn't have the black lower lip on the front fascia, I'd say your options are pretty limitless. You've got a good combo with the white vert and black seats which would allow you to choose almost any color, but to me, the black lower lip kinda throws a wrench in your stripe plans.
I agree with SaddleUp, you should keep it clean. FWIW, if I had a white Stang, this is what I would do in a heartbeat. Clicky
If I had your car, my first choice would probably be to leave it, or do a single wide stripe with the thin runner on each side in black, to match the side stripe.