Rebuild or new cartridge with my zeta tonearm

Post effective mass of your tonearm first, a cartridge must be choose accordingly. Do not waste your time and money with rebuild, you can buy a better cartridge MC or MM, just tell us your budget first. If you;re willing to spend under $800 then you'd be better with MM or MI. If you want to spend more on LOMC then you can also find something better than your Sumiko.  

@chakster the mass of the Zeta is 16 grams I believe. 
@mijostyn thanks for your thoughts I’ll look into those options

I think I would like to stay under $500. That is about what it will cost to get the Sumiko overhauled..

Birdfan, 16 gms seems a little heavy for that arm but I would certainly stay away from cartridges with a compliance over 20 u/mN. If it is indeed 16 gm then you had better stick with the Clearaudio cartridges which are down around 15 u/mN. Most MM cartridges are over 20 u/m. Soundsmith has low compliance cartridges but they are all low output. I assume since you were using a high output moving coil cartridge that you do not have a high gain phono section.

I actually bought schiit’s entry level oh I.. which has all kinds of settings for a range of carts. I believe it will do LOMC. I guess I’ve never been sold on MC as they all seem so expensive.. but I do have preamp