New or old Thorens?

I have a lovely Thorens TD-125 restored by Shopper in Zurich. It still has the original TP-16 arm though, which I would like to upgrade. Having tried and failed to bid on quite a few reconditioned SME3009’s, I’ve been looking at new tone arms instead. Something like an Origin Live Zephyr at roughly $1200. My question now is if I should just forget this idea, sell the TD-125 and plump for a new TD-1600 instead? How would both these options compare SQ wise? My cartridges are Nagaoka MP200 & Ortofon Quintet Blue with Project Tube DS2 phono stage with Gold lion tubes. Many thanks for your thoughts.