The best tonearm for Lyra Helikon SL ?


I have a Lenco L70 slate plint DIY and the arm is a Rega RB 300 OL modified with Lyra Helikon SL. The sound is good but i need more. Which tonearm is better for this combination?
Thank you very much !

Romeo
porto
Thank you very much for all of yours choices !
But the Fidelity Research arm 14, 24, 64 have a better price- they are not good for my Lyra? or Lustre 801 ? or SME 3009 II ?
Dear Porto: I prefer the 801 GST for that cartridge.

Regards and enjoy the music.
Raul.