Linn Sondek LP-12 tonearm recommendations?

The Ekos is a good choice, as is the Ittok, which will save you money if you can find a good one.  I had a Rega 6 something? on my Linn, which was ok, but needed a lot of shims with the Lyra I was using and a different cable routing.  The Ekos was a lot better.  But I agree with cleeds - get it set up and running and then figure it out later.  A lot of people run their Linns with Rega arms.  Shouldn't be a problem.

I have an Akito now. I have had the turntable for about a year (Akurate). I have a Koetsu Rosewood Signature cartridge. Overall I am very impressed with the performance (VPI for a couple decades). I will probably upgrade to a Ekos arm soon, not for a lack of performance, but to see how far it can go. I prefer simple, single vendor solutions. I will also admit I do not fiddle with turntables, arms or cartridges. that would drive me crazy. My audio guy is a Linn master technician and loves setting them up.

Cleeds, Right now i am using Acoustic signature double X with TA 2000, arm/Kiseki Purple heart.
The I bought the Linn for my home office, im going to try and use a shelter501-111, that I have with the new arm I choose, if its not compatible, Ill just get a compatible cartridge

Lin Ittok, Ekos, or a Naim Arro are all proven winners. 

I use a Grace 707 on my Sondek along with a Denon 103D.