Dedicated AC Lines??

Still, no one answered this question:

"I guess I'm wondering if adding a dedicated line would really do anything. All of this 'noise' surely travels back through the breaker and onto the main bus bar in the panel right? Then right back out to all other circuits in the house, including any dedicated line I would add right?"

I've wondered the same thing.

Arch7,
In my opinion good AC outlets do make an improvement in all types of situations, yours included. If I’m incorrect you’re out only about $35 dollars plus shipping per outlet.
Systems I’ve worked on always have improved significantly with dedicated AC lines and circuit breakers, although I’m sure you can find people that will tell you differently in their personal scenario. In your situation, the way you described your set up, I’m sure dedicated lines will make a huge improvement, and should be a first step along with the AC outlet (such as a Porter Port or equivalent).
I can’t explain why there will be an improvement, but I’m confident you will like what you hear. There are others on this site that are qualified to explain the why part, I can’t.
After I added my dedicated AC lines and circuit breakers, the other way I heard another huge improve was with the addition of the Xentech Extreme (5 KVA) isolation transformer. I could live with just the dedicated lines and circuit breakers however I chose not to.
Are there other ways to handle the problem? Sure, some type of power conditioning in conjunction to what you are currently doing, however it’s more of a temporary Band-Aid (in my opinion) then a fix. I’ve tried several products before I installed the dedicated lines and circuit breakers. They did improve the sound however I’m offering for others to learn from my mistakes and take a short cut, including saving some money on their journey to better sound.
New isolation transformers such as a 5 KVA Xentech Extreme are expensive however at times can be found used from an electric contractor or on EBay. The correct isolation transformer can reduce some noise frequencies by (-146 dB). Another good option is a Topaz isolation transformer.
My bottom line is “enjoy the music”.

Lak:
Thanks again for your insight. I recently discovered i could use a separate circuit by cutting through to another room. This curcuit has only a few lights on it and receptacles not being used. I'll add a few of these Porter Port outlets and see what that does. I also saw that some of these Topaz Isolation Transformers seem to be just plug and play so to speak. They have a standard cord on them and either an outlet or cord coming out. Seems like they can be pluged into an exisitng outlet rather than being hard wired at the panel. Sound familiar?
Thanks!

My lessons learned are similar to Laks, as I have evolved to 6 dedicated circuits with Hubbel outlets, 1 for each for the 2 subs, and 1 for each component (amp, pre, cd and phono). The latter 4 are on a Topaz 4kva iso transformer. An important addition was to add a separate 125va iso in front of the cd to keep it from back contaminating the other 3 circuits. My current AC system is a huge improvement over even a previous single circuit with no other devices being used, such as you are considering.

I highly recommend the bigger Topaz, as it takes both common and transverse mode noise down by 120dB. I found it in a local surplus electrical supply house. This iso has a 90lb iron core so these can be expensive to ship. The size would depend on the rest of your components power needs (should be very conservative - at least 1/3 more capacity than your peak demand).

The smaller Topaz isos do have power cords, such as my 125va, but I would not recommend in room use for anything much larger than this. The larger isos get quite warm (110 deg core) and all hum to some extent.

I would suggest you go forward with a phased approach. First, get onto the next room's separate circuit and upgrade the outlet. Second, run one or more dedicated circuts (separate to the cd if possible) with Hubbel outlets. Third, add an iso in front of the dedicated lines (sources and pre as a minimum). I also suggest you not spend too much time or $ on PCs until you are satisfied with the basic AC system. You may discover, as I have, that there is much less sensitivity to them after the other upgrades.

Have fun!