What would be the best type of goldfish to have in a 75 gallon tank with an oscar?

I have 75 tank cycling and want to have a goldfish and oscar. Would the oscar be too territorial? I figure if I add the goldfish first, the oscar will not be territorial. I would like to get a goldfish that will get to around a foot. I would also like him to be beautiful. Thanks!
dont tell me they wont go together because one is tropical and one is coldwater, this rule is for beginners that do not know how to keep happy mediums. I have kept goldfish and plecs before with great success.

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