For speakers, I bought a spool from Monoprice when I did my last theater remodel and ran it in the walls. For audio interconnects, I have a Rubbermaid tub of cables I bought back in the late 90s that is full of "good" analog interconnects that have been retired at one point as things moved to optical/coax, then HDMI. They range from Audioquest to Monster to whatever Circuit City/The Good Guys/Best Buy had on hand when I needed something. Honestly, though, I'm only using analog interconnects in one place, and that's from my turntable to preamp and preamp to a cheap Monoprice tube amp. I guess I'd be curious to learn if cables "age", or if there has been some massive revelation in cable technology that I'm missing out on something with my 20yo cables.