Hi Chashmal,
I have not heard the Naim Aro. I have heard Itok, Ekos, and; owned the Graham 2.2 on my Linn (as well as the Basik, and Akito). I would'nt have a complaint with the Itok, Ekos or Graham. All sound excellent. The Graham ceramic arm may have a little less resonance in the tube, and the uni-pivot bearing; than the others.
I think the deciding factor for me, would be the cost I could find the particular arm available for.
Good luck,
Mark