I've purchased from marcorocks and have been very happy.
Livestock....hmmm, in my 55, I only have 2 no bar clowns (aka naked clowns) a tangaroya goby and a pistol shrimp.
Are you looking to do a specific region or are you looking to do specific colors?
.....aaaand, are you looking to do reef in the future?
I don't run a skimmer on my 55 (FOWLR