The registry set thing can be addictive and expensive as I have several with NGC and PCGS. The NGC competition lets you list PCGS coins also in your sets where PCGS doesn't allow NGC. Good luck in the building of your set as I just finished an all NGC certified MS69 set of uncirculated American Eagles and now I just have to add the new releases to it. I just started on the same kind of set in NGC PR69 UC for the proof American Eagles.