For 1080p Gaming & Future Proofing:
Buy the Sapphire RX470 8GB Nitro+ OC @ 20.5k from
SAPPHIRE GRAPHICS CARD RADEON RX 470 8GB DDR5 NITRO+ OC
First off, I will say that my decision was based on three things:
1) Future Proofing
2) Price to Performance
3) 1080p Gaming
If you compare the reference specs of the two cards, you see that the RX 470 has only ~89% of the specs of the RX 480.
However, thanks to Sapphire's customizing, that percentage gets bumped up to ~93% with the Nitro+ models. That's because Sapphire has increased the base clock and the memory speed, and thus the memory bandwidth --and they've done a better job with the 470 percentage wise, than with the 480. And that 4% bump is a game changer when you look at the cost.