I want peoples opinions on best ac conditioners

I am with Rsbeck on this one. The less between your gear and your power the better. It's like the best preamp being a straight wire with gain. Dedicated, well grounded lines, one for your amp(s), another for your front end. Ideally isolate digital from analogue, but we can't always have everything. I have 20 A isolated ground lines, amps plugged into a PS Audio High Current 20A Ultimate Outlet which is plugged directly into a dedicated 20A circuit. A second PS Ultimate for my pre/analogue into a 20A line. Digital is handled by another 20A circuit. Surge and spike protection is taken care of at the service panel via a whole-house surge protection setup, hard wired to the service.

Audiotomb,
When I had the dedicated lines run to my room, I was fortunate to have an electrician who really knew his stuff. he suggested using whole house surge protection. It is a basic grey box with status lights that takes up 2 breakers in the service panel. Current must pass through it when it leaves the panel and goes to the branches of the house. It buffers the power by intercepting dips in the power as well as spikes and over-current. It's not a regenerator but a regulator. he thought the idea of running 10 gauge dedicated lines on isolated grounds would be compromised to some degree by mucking them up on the terminal end (my room) by a surge protector would be counter productive. I was also concerned that having to rely on something that might limit current to my amps as well. I still have opted to put the front end and the amps on seperate PS Ultimate Outlets. That way non-limited power is available, while surge protection was taken care of up front. Intermatic makes several models, but there are other brands as well. He only charged 200.00 to do it while he was running the lines into the room. The only drawback is if the unit gets hit really hard once, it must be replaced. Replacement is less than 100.00. Never had it knocked out yet after 18 months.