Does anyone have strong feelings about whether 16gb ram is enough for iMac or would you pay up for 24gb?
I would strongly advise the upgrade to 24GB if you multitask, I have 16GB on my M1 iMac and I crash a lot lately, I'm up against the wall with ram but I routinely open multiple browser windows and tabs, listen to music, run Photoshop have X open in a web app, Notes, ChatGPT, Mail, Finder tabs and sometimes Adobe Premiere. If you don't do Photoshop or run all the apps I do 16GB should be fine.
Also the new Apple Intelligence will eat ram, I'm sure that is the only reason they boosted the base to 16GB, 8GB was just not cutting it with the added Apple Intelligence. So you don't want to be kicking yourself 2 years from now, if you have the $$, do it!
So, just think about what you do, and if you want to play with Stable Diffusion or other AI, I would even go 48GB, but at that point you would be looking at the Mini Pro or Studio, or a PC with Nvidia GPU. I'm trying to wait on the M4 Studio and I want 64GB to run more generative AI and huge 3D graphical environments, which really eats memory and needs more GPU cores. I should get a PC but I don't want a 1200 watt heater on my floor with 7 fans.