I picked up my Mathews LX back in October, I have the Copper John Dead Nuts 5-Pin sight with an afterburner light set up. I was thinking of the NAP Quicktune Drop-Away 2000RG, which is as they say "tailored for bows with cable roller gaurds". They were designe for Mathews Legacy and the LX. Check them out.

http://www.newarchery.com/arrowrests/qtrg.aspd