What would be the best looking black pastel to you?

[Repsrul]

Would it also be cleaner? In other words, if bred with a black pastel x pastel and you got a silver bullet out of it would it be less likely to get the spots?

If you breed a Black Pastel x Pastel you would get a Pewter not a Silver Pullet.
Here are a few pictures of my Pewter female from a Black Pastel x Pastel