I've gotten all my varieties from circulation so far; I would love to find a 1969-S DDO, 1970-S DDO, 1992 or 1992-D close AMs but think those are very unlikely. More realistically, I'm hoping for a 1972-DDO (die 1), 1983-DDR and 1984-DDO doubled ear.
Next on my list is the newly confirmed 1988-D transitional RDV-006. I will settle for anything though. I'm not greedy.