Hi,
Though I have never tried the Ridge Street offerings, the AZ in my experience is the best cable at least for the money. I don't think you can go wrong. Have the Matrix Ref I and II and tried buddy's Silver Ref II, both top notch performers and w/o peers in their respective price class in my experience. Generally, smooth and very organic with good neutrality. Silver Ref is sparkling clean w/ fast and tight bass and would match well for warmer system. The Matrix copper is overall, a very balanced cable and oh so musically enticing.
Get a 30 day in home trial and stay with the winner.
Good luck,
Kenobi