I'd go for black on that one.
I just yesterday finished redoing a similar bass, which was actually my first bass back in 2001. I went with black, mostly due to the new finish though
That'll give you an idea on how the black hw works with the white pg. I've been thinking about putting a black ashtray on it, but haven't decided on that yet. If you ever want to change up the tuners, good luck! I tried to find black tuners in the cloverleaf -style that would fit the small holes on the squier headstock, no luck. Ended up filing the small holes to accomodate larger tuners...
Good luck on the project, what ever you'll end up doing, you'll surely have a great time doing it!