The only difference between standard outlets and hospital-grade outlets is how tightly they grip the blades of the plug. High-end outlets, plugs, and power cords have no advantage - none - over standard equipment of the same capacity except that they look better and feel better. The rest is in people's minds. There are no measurable differences. Not a one. Cryogenics means nothing to power lines. Not a thing.
You've already done the right thing by running dedicated 20A lines. It might help (but only a little bit) if you keep the amps and other components on separate circuits, and only due to potential voltage sags. Some people think digital components put garbage on the power circuits, but I've never seen one measurement to prove it.
One exception might be power line filtering, if you have a problem with noise or spikes. Isolation transformers and the like can sometimes make a difference, especially for source components, but most people don't live in areas with a problem. My advice is to get a dealer to loan you the equipment for a day or two. If there's an obvious improvement, buy it. If not, save your money.
Don't waste too much money on powercord-related stuff. Save your money for better speakers, acoustical treatments, amps, and source components (probably in that order). Those are the things that make a difference. Use your head and reason, don't just read advertising and bogus magazine reviews. How could an outlet provide such a superior connection that water boiled 20% faster? That's poppycock. Put on your thinking cap.
