psu? You'll need a new motherboard of course, as I'm sure you already knew.
Case?
Are you planning on building a whole new rig or reusing case +/- psu?
Streaming multi threaded apps go for Ryzen..
Gaming and single threaded apps go for Intel..
Based on your gaming resolution pick accordingly
1080p RX 480 itself is sufficient.
>=1440p get the 1070.
You will be needing a complete platform upgrade whatever you choose, the question will it be blue pill or red pill.