Best Tonearm Upgrades for Linn LP12

The obvious arm is the Ekos SE. However, I think there are few other contenders that might be worth a listen...1) Audio Origami PU7,2) AMG 9
3) Audio Origami UniArm 4) Vertere SG-1  5) Roksan Nima and of course the discontinued Naim Aro. 
I believe most any light weight 9" arm should work ok, as long as it does not interfere with the old girl's suspenders.

The Akito is clearly the best Linn  arm ever made…this might not actually be true, but since I own one I felt I had to chime in.

I use the Rega 1000. I have a VTA adjuster which can be adjusted during play. Works very well. Sorry as I have had brain surgery and can't remember details. Found it on the net and is a small company.

I have an 88'vintage LP12. Started with an Akito, upgraded to Ittok (Huge!), then to Ekos ( agree that it was not that big a difference ; but still worthy if you have the dollars, but would not want to go back to 
Ittok.
Have extensively listened to Aero and it is a worthy Tonearm.
Trick is with any of the arms; Get a Linn dealer to set it up and Tune It. Then you will get the best out of whatever you choose. Correct tuning of LP12 gets them to "play the tune."