Just how many outlets do you need for your stereo?

Keeping it at one dedicated receptacle avoids a ground loop issue. I suppose if you need more than 20 amps (I doubt it) you could always go with 10/2 cabling and a 30 amp breaker and 30 amp rated receptacle. To me it sounds like over kill.

It is a question that cannot possibly be answered. It is dependant on what you own and what you intend to own. You could need anywhere from 4 to 20....who knows?? What is most important is not plugging the power strips/conditioners into different circuit legs. Keep them all plugged into one circuit, preferably a 20 amp dedicated circuit. The niagara 1200 is a great device. Also, the much cheaper furman pst-8. It is designed by the same guy. These two mentioned will give you I believe 15 outlets.
I use both plugged into a single AQ Edison receptacle wired with 12/2 romex (50 ft) to the service panel using a separate 20 amp breaker. Below are a list of what I have plugged into the two...

Integrated amp
Sacd player
Cd transport
Dac
Tuner
Turntable power supply
Phono preamp power supply
Headphone amp power supply
Cassette deck
Digital streamer
Total: 10 items currently...will be introducing my kenwood minidisc recorder and second turntable at some point, so that will be 12 outlets used.....