Dedicated power

If you're going to install dedicated lines, use 20 amp circuits rather than 15. You would use 12/2 wire for a 20 amp circuit, unless you do a split duplex, in which case you could use 12/3.
Some people may suggest you use 10/2 wire. I would be careful about doing that. More likely than not, the receptacles you use will not be rated for use with 10 gauge wire. It would be a fire hazard and code violation.

Bob, it's not the undersized/oversized wire issue that I was referring to. As you state, it's better to have thicker wire. It's the receptacle that I was referring to. Most duplexes are manufactured for 14 or 12 gauge wire, including the hospital grade receptacles that audiophiles often use. If you put a 10 gauge wire in it, the receptacle may overheat and pose a fire hazard if it's not rated for this size of wire. Or the wire won't fit properly in the receptacle. Either the screw on the side won't hold it and the wire will work itself loose with temperature changes, or the little hole at the back for inserting the wire directly into the duplex will be too small. So people may jam it in damaging it. It should say on the duplex itself what size wire you can use. Ten gauge wire is fine. I'm not disputing that. I'm just suggesting that people be careful to do it properly. Also keep in mind that there are often local electrical codes that add to the NEC, thereby imposing stricter requirements. You have to check the area where you live.

Lissnr, I would suggest you consult an electrician. Isolated grounds are a little more complicated than what you outline above. Perhaps you left some things out for brevity.

With an isolated ground, you typically run the white wire from the silver screw on the receptacle to the neutral bus bar at the panel. You run the black wire from the brass screw on the receptacle to a GFCI breaker at the panel. You code the red wire green and run it from the green screw on the receptacle to the grounding bus bar on the panel. The bare copper wire goes from the grounding screw in the receptacle box to the grounding bus bar on the panel.

An isolated ground receptacle does not need a separate isolated gorunding bar. It uses the grounding bar in the panel. It's just that the isolated ground receptacle does not share a common grounding path back to the ground.