I would personally wait until non-k and/or Ultra 3 CPU's show up and Unraid fully supports them OFFICIALLY. I think for most people, an Ultra 3 would be "good enough" in an unraid setup (of course not for all, depends on use-case). When the Ultra 3 shows up, it will likely be with more affordable chipsets (motherboards) as well, like B860 or H810 as well as consuming lower power. Will probably have its limitations as well, but again, all depends on your actual needs! The biggest "issue" that I see with the new motherboards for ArrowLake is that they only have 4 SATA-ports on board, in favor of more M.2 slots. I currently have 6 SATA ports, and would want to avoid having HBA's if I can.
For reference, currently running on ASUS B360M motherboard and i5-9400 with an Intel Arc A310 GPU for Plex-transcoding.