Dedicated AC Power Line vs. Power Conditioner?

Md8232: Your electrician won't have any options. It's the local code that dictates what you can use inside the walls. I personally like BX (http://www.seatekco.com/bx.htm) because it has a flexible steel shielding around it and if your local code allows it, I would use it. It's more expensive to buy and to install, but IMHO the shielding from stray RF, fluorescent fixture, microwave, etc. noises is well worth it.

I would also definitely install an "isolation transformer" (see Wikipedia for more info) which isolates the power from the rest of the house and your neighbors. The transformer effect also isolates any stray power line interference and noises. The power line coming from the transformer on the pole (or underground) is supplying power to many homes. That means all of these homes have a common shared power line in parallel until they get to the transformer. So if anyone is operating a electrical device that generates line noise, it will be fed back to your house wires and to your equipment.

The key factor is do you have the power line wire drop from a transformer only to your house, or is it shared with any neighbor, regardless of the distance between houses.

You don't need a metal outlet box with BX, but to continue the shielding effect, you should use one, including the cover plate. Cost difference is negligible. You could use a standard plastic cover on the outlet to match the rest of the house.