For interconnects, I think Kubala Sosna is definitely up there with Siltech and Crystal, and they are a good alternative if silver doesn't work for you. Jorma Design cables are incredible, but they cost an absolute fortune. At more earthly prices, Wywires are excellent.
For power cords, check out the very little known but very good 6Sons Audio cords. I'm also a fan of Stealth's Cloude 99 cords. Wywires sells much more affordable cords as does Triode Wire Labs.
For USB, definitely check out the JCAT.