Sota Star Tonearm Cartridge Choice

I've finally decided to upgrade the Rega 330 and Hana EL on my refurbished Sota Star with the upgraded electronics. I spoke with Christen at Sota and he recommended another Hana and an Origin Live tonearm. The Origin Live Silver Mk IV with a Hana S will keep me under budget. The Origin Live Zephyr Mk 4 with the Hana S will put me a little over budget. Is the Zephyr significantly better than the Silver for the extra $400, or do you need to get up into the Encounter?  Would I be better off going with the Silver but a Hana M cartridge? 
Thanks,

John Cotner
New Ulm, MN