Which Tonearm to go for VPI HW-19 III?

I agree with Scott and Ed, the mk IV upgrade is well worth it. If you want to take it further, you can add the Stand Alone Motor Assembly (SAMA) and Synchronous Drive System (SDS). That takes the HW-19 concept about as far as it can go, which is pretty far indeed. I'm happy using the JMW 10.5 tonearm with my full blown HW-19 setup. I never tried the Rega RB-900, so I cannot compare. I did originally have a RB-300 and I'm much happier with the sound of the 10.5 tonearm.
The mk IV upgrade is the first place to start though.

Regards,
John

Steve,
I would deal with VPI directly. I've found that to be a more direct route. As for the Discovery cable, many tonearms come wired with Discovery cable. All VPI JMW arms are wired with Discovery, as are the Wheaton arms (Tri-Planar). There are a couple other tonearm manufacturers, but I can't remember them right now. I liked my VPI JMW 10.5 so much I tried a 1 meter length of Discovery Essence between the arm and the phono stage. It was a big improvement over the more expensive Phono cable from Transparent Audio that I had been using. So this is something that may interest you, after the mk IV upgrade of course.

Regards,
John

Yes, it's fairly simple. If you have any questions, VPI has answers too. Great customer service.

Regards,
John