Mike, we use mainly APC brand voltage regulators for our network servers. They have a good reputation and reliability. They will not be the cheapest however, but I can stand by their quality. We use ones with built-in batteries so we have 24 hour operation after a electrical outage, I doubt you need a backup like that, but they do sell just the regulators and I believe they have built-in surge protection as well. Brownouts (low voltage) can be as destructive as a surge and that's where a regulator would help.
