hum good question ronnie, IMO I'm thinking a candidate might be Paul Castellano, he was a shrewd businessman, owned many legit business interests and obviously many illegal one's. he had a reputation as being greedy too so he was taken huge kick-ups from his underlings, I bet with the power of 20+ Capo's he was taking in ridiculous amounts every week. He flashed his wealth with that "White House" he built on Staten Island.
Someone else to consider would be Gambino though he didn't flash it around.