Tank transfer method would be my #1 as well, because it's guaranteed to work on the fish. However, the tank transfer with that many large fish would be a logistical nightmare and would be very labor intensive on your part. Tank transfer also doesn't do anything about the encysted tomonts in the display, so after the 12 day transfer protocol was done you'd need to fallow the tank for a couple months.
Hypo would be my next choice, only because it's easy to do and doesn't involve poisoning fish.
Copper would be choice three. And only if you can do it in a separate QT tank with no sand or rock.
Can I ask what's making you decide to do this? Are you losing fish due to the ich, or do you just want it gone?
The only option that doesn't involve fallowing your display tank for 9-10 weeks is the hypo of the display, but man, that's going to be a cycle to stay on top of.
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