To be the devils advocate, if the most recent incarnations of amdS gpus have any distinct and meaningful hardware legacies in vega, then its tempting to be closer to the vega ecosystem.
dunno, but i dont think much changed betw 480 & 580 - both are 14nm polaris?
if u gpu is so old, u r easy to please for a while.
u could go below the level miners want & escape that premium, spend $150 on an amd polaris gpu, wait a year & get vega, sell polaris for $80?
some folks mainly want modern connectors on their pc - too much power is a pain, & the cheapest such card is ~90usd new. it should sell ok.
the brand escapes me, but its well known asian one - i hear good things about their factory OC 470 gpu cards, cheap, may only be 4GB tho.