Rob,
Any device or voltage regulation component that is close to the source components will not sound as natural and effortless. Look into voltage regulation at the AC panel of the house. This still has to be tested to see if the benefit of AC regulation outweights any minor drawbacks if any. The further the AC panel is away from the stereo room the less negative effects you'll hear. Only folks with a Tripoint Audio solution power conditioners will be able to hear all these traits of artifacts and compression of any isolation transformer voltage stabilizer.