There are a number of goon ones these days, I'm using Bose on planes, but the main thing is to get one where the whole ear is covered (so it completely seals against the head with the ear inside, with no pressure on the ear at all.) They cost more, but are far more comfortable, and let less noise in around the earpads.
Cost should not be a factor. You go for the best you can find.
The problem is though, they are best for continuous noise, as even the best of them will allow odd noises to go through. Hence you need to ask a specialist salesperson for advise, and so some serious research, including asking here and other forums/groups people about specific brands and the specific problem.
This is going to be a several hundred dollar plus purchase, and I'd beware of buying off ebay for something this important.