Decent gpu around £350

I’m looking for a gpu for the lads gaming pc around £350 we both mine a bit of doge coin from unmineable so want something that would perform better than the 700h we get from cpu mining

for a AMD you’d be looking at RX570-RX580 8gb used and for a Nvidia it’d be a 1660 Super 6gb or 1660 TI 6gb used