We've got an early 2009 20" iMac that's still going strong on Catalina (upgrading the boot drive to SSD and maxing out the RAM made it useable). Despite its general web-surfing, chat and excel/word usability, it fails to run Webex so it now really is time to go for a new machine. Should be quite the upgrade coming from iMac 9,x to iMac 21,x. Also, this is the first time that I realized that the iMac numbers correspond with the year of their release - is this intentional? As an aside, does anyone know why all product codes have a comma and not a period? Is it a hold-over from Jobs' design-thinking?