Sherry, The underlying Silver or Gold genes are not obvious in the solid colors unless they display some leakage and that's not something you want to introduce into your line. You may get leakage when you cross lines anyway but that is another issue.
The best Black lines are based on the Gold color, and the best blues are based on the Silver color. If You intend to use a black male, you might be able to find a Black male out of a Good Blue line that carries the silver genes. There are a couple of breeders that are very careful to keep their blue/black lines separate. Alternately, if you have a nice clean Self Blue male that carries a silver rather than gold in the hackle, you can use him with black females. The females from this cross will carry the silver from the male as its a sex-linked gene. Then you can use the new pullets with their father again. This should get you about half Self Blues, half splits again, with both sexes that carry Silver. This should help to reduce the gold or straw colored hackles that happen in the Self Blue offspring. That would be my direction, some others feel free to chime in if they have had some other experiences or can point Sherry to a line of birds that they would recommend.