The Furman PST-8, for the money, is very good. You mentioned the PST-8D, be advised that that model is dedicated to digital sources only. I’m not certain if you are aware, Garth Powell is the designer of the Furman PST-8. He used to work at Furman. He is the same guy that designed the Audioquest Niagara 1000 and 1200, as well as the more expensive models.
I will agree that it is advisable to run a dedicated circuit to your hifi. It can be done cheaply (if you are proficient in electrical work) by running a 12/2 romex (yellow) from a 20 amp breaker to a high quality receptacle (audioquest Edison for example). Then you will also need to buy some high quality power chords to take full advantage of your new found better quality power.