Tonearm & Cartridge Upgrade for Sota Saphire

In 1988 I purchased a Sota Saphire III turntable, with an Audioquest PT-5 arm and Grado 8M cartridge. Currently I'm using a Grado MCZ. I was thinking of upgrading to the new Audioquest PT-9+ arm with a Clearaudio Aurum Beta S cartridge. I am using a Conrad-Johnson PV5 preamp and a MV50 power amp connected to PMC FB-1 speakers with Synergistic Research cables. I also use a Bryston BP20/3B-ST amp combo. Any comments as to my upgrade choices. I love midrange accuracy. I listen to everything. Classical, blues, rock, anything acoustic. Thanks for any help.