Most suitable tone arm for linn sondek LP12

If you have no complaints about the sound, I would keep what you have. The OL arms are very decent. I don't know what you're using for a phono stage, but if you're using a cheap one, a used Linto might be a good upgrade. They are a great deal on the used market - about $800 or so, and deliver very high performance for that amount of money.

I have an EAR 834P phono stage with Denon AU S1 transformer as step up.
Cheers

ARO is best, at least in my listening. A unipivot and the LP12 are a fantastic match. It think it helps you get a little of the air back that other arm combinations can eat up. Moerch UP4 is also great but the armboard is a little expensive.

I dont know if i am missing anything....Just wondering what would be a good choice if i want to upgrade my tone arm. Something way better than what i have now.

Don't even think about it. Linn LP12 is the most remarkable turntable from tonality, soundstage, it is the benchmark in PRaT coloration and adjustments are rarely necessary. It is legend. Thousands can't be wrong when they purchased it. :-)

I was a Technics dealer in the days when the SP 10 was new; I never had one as it was thought to be very expensive in those days. I had an SP 15 with EPA 500 arm as a demo. I like belt drive better than direct but YMMV. I have had some large and heavy tables in recent years: VPI TNT, Aries Extended, Basis Ovation among them. I am happy with the LP12 but there are there are other good tables out there; pick one that gives the sound you like; even the best tables have their own "sound".