New home - shoulda woulda coulda's

I would start with 'dedicated' lines for your equipment . Run seperate lines for analog and digital items . Connect these lines to a seperate 'isolated' ground system with the grounding rod at least 10ft. from the main house system grounding rod . Use 30amp hospital grade recepticles for their better metal content and superior plug holding ability . The red ones denote isolated ground. Use 10/4 copper cable for the runs and 30 amp breakers . Do not group these 'dedicated' wire runs with those from the rest of your house . Make sure that the grounds are 'isolated', within the confines of the panel, from the rest of the house system . Use the best components that you can reasonbly afford, don't go crazy !
This system will give you an abundant power source for your equipment that won't be cross contaminated from anything else in your system or home . It will not however 'clean' the power that is coming to your house. That is a different process that has been described here many times and is not part of the 'infrastructure'.
Good luck .

Make sure you have dedicated circuits (and grounds) and LOTS of outlets all over the place (even in the ceiling - lighting and ??)

There's a number of threads regarding dedicated circuits here. A little research and you'll find a lot of info.

WATCH them work! make sure what you want done is DONE! don't have any doubts about your electrical wiring. ASK what they are doing. i can't stress this enough. d.

Uncertainsmile makes a good point. a couple of other issues along the same line -
1) Don't pay too far in advnace - I had an electrican disappear after getting a $1000 check.
2) Completely define the work you're getting done, and have it agreed before. Make sure you know what you want and don't let an electricain tell you they'll do it a slightly different way. I've had to redo a lot because of him not having a clue what I was trying to accomplish.
3)If you're getting more than one dedicated line have a foolproof method of telling which is which rather than having to investigate what's where - another disappearing trick.

I just finished one last year and ran four dedicated circuits to the audio area, 1 at 30 amps for the amplifier and the rest at 20 amps, should be enough. I used P&S outlets. Consider a whole house surge protector. Also, I would recommend lots of fiberglass in the walls. Maybe investigate the feasibility of in-wall bass traps (I don't know if that would even work due to reflection off drywall). If the room will or could in the future be used for HT, you may want to run wire from a binding post jack in the wall to the ceiling for surround speakers. Finally, the thing I forgot to do is to run a subwoofer cable to the rear of the room for HT bass, fortunately I was able to pull it between the floor joists above the basement drywall ceiling. Have fun.