iMac as monitor?

jhille wrote:

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Will probably just go with a new iMac.

⚠️ Whoa! I believe you are about to make a very expensive mistake.

No new iMac can Do Target Display Mode , and no M1 Mac supports TDM either. Start your research by reading the very limited groups of Mac that participate in TDM and macOS limitations in this Apple article:

https://support.apple.com/en-us/HT204592

Ignore 99% of the junk written about TDM on the internet. "Publishing" on the web requires neither an editor, research skills, nor ethics of accuracy!

No you cannot. You could purchase Luna Display and that may support it, however if I were in your shoes I just buy an external display for the new Mac. This is much less expensive, easier to setup and much much more reliable.