Goodluck finding those mate. While you were designing your rig other have already cleaned out the shelves. There are no more 470/480/570/580 globally.
Lets just hope Chinese manufacturers will do the good thing and not hoard all those Hashes.

To Answer your question my picks for you are.
MSI Radeon RX 470 GAMING X 8GB

I will also choose that brand for the RX580 as well
From the discussions those 4GB, for ETH  will no longer work by Q1 2019, thats 1.5years from now.