Looking at picking up on the 2017 27" iMacs as a family PC but with a heavy slant towards my usage. Will be targetting the base or mid tier models and changing the fusion for a 512GB SSD, but I am unsure on the performance difference of the 570 vs 575. Photo/video editing I get it will be totally fine on either one, but I do occasionally like to game and have a pretty large steam backlog from years ago so would like to occasionally get through these in bootcamp. Nothing AAA here as all my current gaming is via console, but wondering what is the gaming performance like on the base 570 vs the mid 575? 1440p I guess is the sweetspot on this display too? The 580 is out my price range at pushing NZD$4500 here with SSD which is too much.