Dear @xagwell You can't go wrong with either of this alternatives. I own your 90X and these two better cartridges quality performance than the 90X:
https://www.audiogon.com/listings/lis9aee1-lyra-kleos-mc-phono-cartridge-like-new-cartridges
https://www.audiogon.com/listings/lis9c350-van-den-hul-colibri-xgp-gold-lw-new-latest-version-cartridges
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
https://www.audiogon.com/listings/lis9aee1-lyra-kleos-mc-phono-cartridge-like-new-cartridges
https://www.audiogon.com/listings/lis9c350-van-den-hul-colibri-xgp-gold-lw-new-latest-version-cartridges
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.