Virtual Dynamics: Audition vs. Reference Series

I am considering upgrading from the Audition to the Reference series in all cables (power, IC and speaker). Has anyone out there done this? If so, what differences are you hearing?
I find the Reference has a bit more detail. In addition the soundstage is larger and has more bass. It is not nearly as dramatic as the difference between the Audition and Sig. The price difference between the Ref and Sig is only about $250. Well worth the extra money