I've narrowed my power cord choices for the 501s down to the Wireworld Aurora 52, Stratus 52, PS Audio Jewel AC, AC-3 (outside shot), Pangea AC-14 (for sources only, though they can be used with power amps), and Shunyata Venom3. These all reflect the state of my budget at this point, and the AC-3 is the most expensive of the bunch (MSRP $239.99/2m).
I haven't determined how I want to set up finally. Now, I'm using a power strip to extend the right 501 to my LCR2400 power conditioner; I think an extension cord would be better but the best is a direct connection, which means a 3m cord (and more money). I am also considering a PSA Duet to extend my LCR to the wall rather than plug in directly, to offer an additional layer of filtering and the automatic shut-down feature; this is available with my current setup, but the HT1210 the LCR goes into has a 14-gauge cord rather than a 12-gauge as the LCR has. I wonder if I'm limiting current, even though the system doesn't pull anything near the HT1210's capacity (12A, whereas when playing music the system pulls only around 2A). Getting a Duet would necessitate another cable.
I notice a lot of people with WW cords on their Macs, some with PSA cords. Venom is getting a lot of positive press, but the 1.5m length is tricky in case I reconfigure my system and they prove too short. I was thinking about doing that next year if possible, with a Salamander rack replacing the Hooker cabinet I use now. The PSA cords have the detachable ground pin, which could be an advantage; they and the Pangeas also come in a C7 configuration should I go for upgrading my source components that use them.
Then, of course, there's flexibility. This is a major criterion, and the PSA AC-3 would be the least flexible from what I gather so far. The new WWs are said to be flexible, and due to multi-strand construction I'd think the Jewel AC is also. The Venom3 extension cord I have isn't too bad.
I have a $500 credit with The Cable Company I want to use. I'm hoping to sort this out soon.
VPI, Grado, SME, Pioneer Elite, Magnum Dynalab, Oppo, DVDO, McIntosh, JJ, Mirage, Kimber, Transparent, MIT, Pangea, Wireworld, Shunyata, PS Audio, Furman, Sanus