Aka loot that is actually worth the 200k+ you are gonna pay for it.

Silver: 1% drop rate, actually epic stats every time. Yes, really.
Gold: One of a kind randomized items with truly legendary stats, <0.5% drop rate. Yes, again, really.

These would be epic.

EDIT: Oh, and just bunch the grays into whites cause they're all pretty much the same anyways.