I'm guessing here, but if you're running the amp through a cheap surge protector, that may be limiting the current it can draw to the point where a dip elsewhere pushes it over the edge -- amps need an uncluttered path to power, and that little Radio Shack power strip may be getting in the way too much. Something like a Panamax MAX5100 or MAX5300 might be a worthwhile replacement for the RS strip.

The collection of devices on a single circuit doesn't seem too unreasonable as long as there's not a lot else in the house on that circuit -- I run my entire system off a single (albeit dedicated) 15A circuit.

Adding a circuit will depend on the specific conditions. In my case, I was working in exterior walls of a little bity house, so I surface mounted conduit outside for almost all of the wiring -- quick, easy, cheap, and aesthetically dubious. You'll need to identify the shortest and most painless route from your electrical panel to your equipment. An attic or crawlspace could help minimize drywall work and keep the installation cost down.

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