Voltage Regulator

I live in an old apartment in San Francisco and I'm pretty sure my place suffers from voltage swings, dirty power, etc. I was also told by an electrician that, like most older buildings in SF, it's not grounded. I've been looking at the ExactPower 15A as a solution but it's quite expensive. I currently have an Audio Prism Foundation III for a conditioner and am fairly happy with it. I plug my amp directly into the wall. Are there any moderately priced units out there that would help with the voltage fluctuation? If so, would I be able to plug my amp into it and then plug the Audio Prism into it also?