Parts Connexion has a variety of high end cables and plugs but I ended up using all silver plated Viborg from Amazon and Mogami from a variety of sources. I think I got the thin Mogami sound runner 2 conductor speaker cables from Parts Express and MarkerTek for the 4 conductor speaker cable.
Replaced all my other high end cables easily.
My experience with silver plated speaker cable is that it takes a while to break in and then sounds exactly like plain copper. OTOH, I use Parts Express branded solid silver / shielded and balanced conductors for my most important ICs.