I have owned the REL storm and have two audio physics lunas. The REL is a fine sub but the Luna is much better. I haven't heard the Rhea but I am sure it is another step up. I got the Luna's because I wanted stereo subs and cost wise and size wise the Luna's made more sense. Mine are not matched to Audio Physics speakers. I am using them with Lamhorns and REP drivers. With Audio Physics speakers I think it would be a no brainer to use the Luna or Rhea.
