I have an APC SmartUPS 2200 on my system. I had a lot of trouble at this house with short power outages, usually just a few seconds, and besides being annoying when the DVD player resets etc, its not good for the equipment when the power comes back on suddenly. Make sure when you get a UPS that it has a pure sine wave output on the inverter. Most UPS models use a square wave or sawtooth wave since they are designed for computers - and the computer power supply can smooth that out good enough, but for an audio system, that will create a buzz and is probably not very good for your system. The APC SmartUPS series has a sine wave output, but the other models like BackUPS use a stepped square wave so you'll want to avoid that.
