Which of these power cords is best?

Obviously there are many exceptions to this claim, but I generally believe that you get what you pay for. I have consistently seen this with every independent audio manufacturer whose product I've purchased or auditioned: Wright Sound, Quicksilver, Silverline, Wolff, Resolution Audio, etc. Their marketing and advertising costs are in the product itself.

The bigger companies produce superb products as well, but you are always paying for more than the product. When I saw Banana Republic spend $50K for a one day shoot, I suddenly realized why that $2 shirt became $40 by the time it made the catalog. I don't mean to take the thread in another direction. It's just something I consider when trying to get the most performance for my money.
Enjoy,
Howard

One other consideration, Cdc2, is that you might want to consider trying out some other speaker cables as well. You have a stellar component setup, and I would guess that the Q10's curb the potential of your system. I've tried the Q10's against at least five other cables and found this to be the case each time.

Looks like Audience has increased their prices...