Thank you both, @Auburn @k8tpayaso!
I will follow your advice and add a self-fertile. Prefer early and mid season vines, because the late season ones may not ripen in time here in VA.
Here is my plan. Wanted to add more diversities. Could you please share your thoughts and expriences.
 Black Beauty
Plan to add:
 A self-fertile – Triumph or Hall or Lane.
I was thinking to get Paulk, but it’s mid-late season, so less desired.
Between Triumph and Hall, which one is better? It seems more people like Triumph.
Lane is a popular one too. Is Lane much better than Ison? If not, I will skip it.
 A bronze female - Sweet Jenny or Darlene. Which one is better? It seems Darlene is more popular.
 A black female – Supreme or Sugargate. Both are excellent. Not sure which one to choose.
Right now I am thinking to pick  Triumph  Darlene  Supreme.
Maybe the differences are not that big. Picking either from each group would work out just the same in the end.