Do I need a power conditioner?


I’m in the process of dropping a dedicated 20 amp circuit or 2 into the music room.
So if I have a dedicated circuit for the amp, and a dedicated circuit for everything else,
is a conditioner useful?
I have several fairly decent systems going that I tweek and retweek.
Just got around to upgrading cables. Avoided conditioners because, in general, they dampen the presentation.
Was using a PS Audio PPP for low power components. But fell for the Shunyata spiel.
Plugged in a Hydra 4 with a Python Helix and was very happy with how it cleaned up the Zu Druids.
Seems high sensitivity speakers maybe reveal the grunge also.
Moved it to my system with the Martin Logans and the presentation seemed a bit lean and just a bit lifeless, using just copperhead cable to Hydra. (using all Pangea to get from the Hydra to other components.)
Then I put a Black Mamba from Classe amp straight to the wall and Wow! Single most significant tweek ever for me.
So I’m thinking, maybe I don’t need the Denali I ordered if I just use a couple dedicated circuits and some Shunyata power cords everywhere.
Opinions?
Thanks. :)
leotis
How would he know he made a good decision without trying both the Shunyata Denali and Equitech 2RQ?
Dealer where I got the 2RQ is also a Shunyata dealer. He has Equitech unit in his home system. Hope that means something. Equitech technology sounds good on paper. Shunyata is a little opaque about their technology. I have the 1st gen Shunyata going (Hydra 2 and 4.) Mid range sounded a little bleached out till I added their Black Mamba PC from the amp to wall. Every new generation of Shunyata "sounds way better" than previous generation. I've heard the Denali and it sounded freakin fine! Taking a bit of a flyer on theEquitech. We'll see when it arrives in a couple weeks.
I believe that leotis made a good decision due to the attributes provided by a high quality balanced AC power isolation transformer. My confidence is based on the technology and good implementation of balanced power supplying audio components. 

The Shunyata may also be a fine product but it does not offer the merits of balanced AC.
Charles 
Thanks for the responses.  Awaiting your impressions of the 2RQ.  I am using a Shunyata Hydra Talos (6 outlet) conditioner in my system connected to the wall with an Alpha HC 20amp cable.  I very much wanted the Denali, but gotta feed the family while struggling to find audio nirvana.  :-)  

If your dealer carries Shunyata, maybe they will let you borrow a demo Denali unit for a home evaluation.  My dealer allows this, but they don't have any Denali's in-house.

Jason
I've heard Denali at the local dealer. Sounded wonderful. But it was part of a $200K+ system. So how much to attribute to the Denali? I am getting the Equitech from an out of state dealer to avoid massive sales tax. The more I read about the history of balanced power the more convinced I am. Appears Martin Glasband revolutionized the recording industry with it's introduction. I am led to believe that virtually all high end audio and video production uses balanced power technology. Availability for home use is a relatively recent development. Thanks again to Audiogon forum for introducing me to a better idea that I knew nothing about. Wish I had resorted to Audiogon for advice before I had dumped large $$$ on so much gear that didn't stand the test of time in my system.