I have this for my 16 m1 max. It is an excellent monitor. Charges, has ports, fantastic color and picture quality, and a reasonable price. All iMac displays are manufactured by LG so I like to keep the same brand.

LG UltraFine UHD 27-Inch 4K UHD 2160p Computer Monitor 27UN850-W, IPS with VESA DisplayHDR 400, AMD FreeSync, and USB-C, White,Silver
Upgrade to an LG UltraFine IPS 4K screen, delivering ultra HD resolution with supremely accurate colors, even when viewed off-angle. The 27-inch display offers versatility of USB Type C connectivity (60 Watt power delivery) plus the benefits of HDCP 2.2 compatibility, so it will seamlessly displa...
www.amazon.com
As an Amazon Associate, MacRumors earns a commission from qualifying purchases made through links in this post.