The Zeta is imo a good recommendation. If anyone finds one that could use some TLC, Johnnie at Audio Origami is very familiar with the arm, and himself holds it in high regard. He will take yours apart, clean, repack, and adjust the bearings, and if you wish rewire the arm with your choice of Cardas copper or two different silvers.
The Zeta is a true medium-mass arm, around 16g depending on how many of the metal "discs" are installed in the adjustable-mass counterweight. Occasionally available in good condition for just under $1000.