Rebuild or new cartridge with my zeta tonearm

Sounds Good? Perhaps preferred by some, however, the specs of separation and balance of the Clearaudio Performer are not good, they must limit imaging compared to OP's Sumiko.

https://clearaudio.de/en/products/cartridges-mm-v2.php

A refurbished Decca (or new - a little expensive) loves the Zeta arm.

Sumiko, already rebuilt, new stylus, 30 day returns, very tight measurements

https://www.ebay.com/itm/184383174547

or, he can give you a price to retip yours

under his name, you can click on 'see other items', 

never buy refurbished cartridges, save your time and money

I'm going to agree with Chakster on this one. I would never buy one and I have never had a cartridge re tipped. There is always the desire to try something new.
Elliot if you read the specs on Ortofons they do not look particularly great but several of their cartridges are world class. I guarantee you that the transient response, tracking and dynamic impact are all superior to the Sumiko beside being within budget and meshing with his tonearm.