[where the gold at?]

looking to try and complete my set.
I need Koufax, Snider and Hodges.
but am looking to upgrade what i have as well.
this is what i have
moon psa 7
craig psa 5
roseboro psa 5
alston psa 6
dyrsdale psa 7
neal psa 6
sherry psa 6
podres psa 6
thanks in advance.