I need a headshell recommendation for Technics 1200 GAE

@rauliruegas or anyone else, at the risk of beating a dead horse, I want to make sure I understand this.
My SL1200-G has a tonearm with an effective mass of 12 gr. The headshell is 7.6 gr. If I remove the stock headshell and replace it with one that weighs 12 gr. is the effective mass of my tonearm now 16.4 gr.?
 

@ericsch It will be close enough to 16.4g.

Another option which I used with an ART-9 is the Nasotec Swing headshell. It may appear quirky but it works very very well.. I sold my 2 SAEC ULS3x shells for 2 of these, and compared it to a Shun Mook recently, and much preferred the Nasotec. Not cheap, but you didnt mention budget..

I also have an ART9 and getting ready to order the Nasotec if anyone is interested I may be able to help with the cost pm me

This is my ZYX LIVE-18 headshell on EPA-100 tonearm, highly recommended. 

The old shells i like a lot: Grace HS-6 Carbon and the lightweight Orsonic which you can find here in the gallery.