I think a good choice for a good homelab switch could be a Ruckus ICX7250-24p. It's a 24p switch, PoE on all ports, with 8 sfp+ cages running at 10G speeds. Idle power is not insane (50W) and once it's booted up the fans are audible but not too bad. You should find those on ebay quite easily.
Just attach it to the machines you keep in the rack with DAC cables, and use one or two 10gbase-t modules for the PCs you need to actually cover.
Here on STH there's a whole thread about these Ruckus switches, and also some other models:
I don't think you can find any 10gbase-t (rj45) switches with many port at reasonable prices. QNAP does have an 8+8 RJ/SFP+ 10G switch available, but you're well into the 600$+ range.