I am currently using a 3600. I built this PC with the plan to do the major upgrade when Zen3 and Ampere come out, however, I am so impressed with the 3600. That is the bang for your buck processor for most of us right now.
I am using the Palit 2070 Super Jetstream. I was going to get the Powercolor 5700XT Red Devil, but found this for £40 more, so I made the jump and haven't looked back. It is great for 1440p.