The best tonearm for Lyra Helikon SL ?

I think you're best choices here are the SME IV.Vi or V, a Graham Phantom...then maybe a Tri Planar.

Do a search on these arms...you find a few thread discussing Lyra and SME/Graham as the best choices.

I am running a Lyra Skala with a Tri Planar VII uII with great success...