I use a variety of different stuff but right now the best IC's I've heard for silver is the Acoustic Zen Silver Reference II. Quite expensive, but again these are serious cables for only those that are willing to shell out the price. There are a variety of used ones on Agon from time to time.
I've built the exact same cable that AZ builds using Neotech NEI-1002. That is the exact same wire they use, with of course their own twist. From the reviews I've read they are basically the same sonically. Even going the DIY route isn't cheap.
My everyday cables varies as well, but I've owned Signal Cable, Wireworld (one of my favorites for people on a budget), Trevor's cables (formerly Norse Audio), DH Labs, and Acoustic Revive. I've demoed a bunch, and like many others the differences are not huge. Just like swapping headphone cables you aren't going to hear a drastic difference, but it will be there subtly.
For power cords, I like VH Audio, Neotech, and DH Labs. If you want something that is really hard to beat for the price, try DH Labs Power Plus cables. They are reviewed well, and match up with that $1000 snake oil crap.