I tested a bunch of PCs about 3 years ago on my Granite Tube CDP Model 657. I liked the Walker Audio Omega Mikro Planar more than anything else I tried (which included Elrod (which I use on my amp), VD Nite, Stealth M-21, Genghis Khan and a few others). Incidently ... I have an Omega Mikro for sale on a-gon right now (I am keeping one for my 657).
As for the Ridge Street, I haven't tried their PCs, but I'm very happy with their ICs (just ordered a new set of PIII sigs). I'm sure the PC is a winner too.
Also, I found both Larry Walker and Robert of RS to be a pleasure to do business with.
Good luck,
David