That's a massive help thank you! I'll be leaning towards the RX560 then with maybe the 1060 up my sleeve pending how savings go over the next little bit of time.
One add-on question though regarding the PSU I'm struggling with. I'm probably doing most online PSU calculators wrong, but most calculators say my current set up needs between 300-320W, and the new setup would need about 360W (with either RX560 or GTX1060). I can't find specs for the exact model number online either, it keeps saying things close to it are a 700W PSU... but that doesn't seem right. But if it is then I guess I wouldn't need a new one. But yeah not sure if I got a new GPU and what wattage I should be aiming for. Thankfully I guess in comparison they're a lot cheaper! Although I guess it couldn't hurt getting a new one? The prices do confuse me though when you have some 650W being $5 cheaper than some 750W ... but so long as I know what I'm aiming for!
Actually I'll attach a photo of my PSU, someone will probably know at a glance what it is https://imgur.com/a/qngd1