Is a high priced Line Conditioner needed

With dedicated circuits, I have found that an easy and effective route to take with very good results is to install a Shunyata Defender (about $200.00) in the unused outlet. This little device cleans up some (inevitable) noise from the AC AND gets your equipment protected without any ill effects on the dynamics.

I recommend you should get a monster power htps 7000. I own
three of them, they do a good job of power conditioning and
protecting from spikes and surges. It sounds good to my ears.
Don't listen to the monster haters, you can always return it
if you don't like the sound. I highly recommend it!

Update...went with a new Bybee Stealth (latest revisions) with a combination of Furutech Gold and Rhodium outlets early last week. I had the good fortune of picking up a fully broken in version that had been with reviewer until the week prior on a prior reserve order. The PP is gone and won't be coming back; I am ecstatic and blown away by what the Stealth is doing for my system, better imaging, even quieter and more black backgrounds, increased precision coupled with naturalness of images, instruments and voices,....this unit is beyond my expectations and is without a doubt the best I've had in my system........

I had the Stealth and changed it for the Holographic strictly for the better. After that I connected a AC Module in the amps fearing it to be too much of a good thing...and I made another jump in quality.... These things are incredible

Only If you have good equipment-and a fussy appreciative ear.