Suggestions for/Where to start with Silver/Bronze Age

Keep an eye out for the Epic collections. The lack of rationale behind the order of their release is a little maddening, but they do seem committed to getting most of their main titles reprinted in full. Although that might mean waiting five years for them to get around to the volume(s) you're looking for. But I know the Black Panther Essential volume was another that became prohibitively expensive and they've already Epic-ized that material.