Audio-Technica AT-ART9 phono cartridge

Gotta say ... I moved up to the ART-9 from a AT-OC-9mkIII. The ART-9 is in a different league ... but BOTH are absolute killers on mono records. For someone like myself who has been collecting jazz records since the 1950's, that's a very important feature.

Greetings all, I've been lurking and signed up to see if anyone had any suggestions on a headshell for the ART9.  I just received the new SL1200GAE and have pretty much decided on the ART9 based on many of your comments and my own experience with the OC9mkII.  I have a magnesium Jelco HS25 on order.  This new Technics also has a magnesium arm but I don't know the mass.  Thank you for all the thoughts on the ART9.

^^^ I can't speak for head shells, sorry. I can speak for the ART-9 though. It replaced my OC-9 MK III almost exactly a year ago. Over the past year, I've made some real significant improvements to the system. Just multiply everything I've previously said about the ART-9 by a factor of ten. Its WAY better than I thought ... and I was amazed by it before. Its a real sleeper and a great value. You're making a good choice, unless you want to get into the $5.000 range. 

Thank you for your reply ORpapa.  I brought vinyl back to my system a few years ago with the last of the SL-1210M5G and an AT440MLA.  Moved on to a DL-103R.  Then a friend gave me a broken OC9.  For a reasonable fee AT replaced that with the MKII.  Great sounding cartridge.  Added a Bob's Devices Cinemag Sky 30 and a Libertyaudio B2B-1.  The sound of vinyl is amazing.  This really is a journey.

^^^
I've looked at that Bob's Devices product at the Newport show over the past few years.  I've been tempted. I have a very good phono stage (ARC PH-8). I was wondering if I could make an improvement by adding the Bob's Devices unit to the system that would justify the price.  The ART-9, at .05 output works perfectly in the system. What improvement could I expect with adding the Bob's Device, if any? Any ideas?