Power Conditioner for your amplifier?

Thanks for the advise Antonio.
About the isolation. I haven't tried anything under the amp yet. I recently bought a new component stand - Solid Steel 5.4 and had few isolation devices laying around. Tried them. Found them to make some difference under my preamp and absolutely no difference under my cd player. I guess the rack is very good in this regard and a cd player is pretty immune to vibration. Under the preamp I use Herbies Mini Isocups and Herbies Hal-O tube damping instruments on the tubes in the pre. Clears up and expands the soundstage a bit, but on my previous rack it made more difference. Basically, the Solid Steel was a nice improvement sonically to all the components, I think.

Once the amp fully breaks in, I'm planning on trying some Herbies ebony domes under it. We'll see how much difference these things will make, but I'm not expecting a big change, again, due to the Solid Steel's ability to control vibration. Besides, the stand itself is on spikes sitting on top of Target spike shoes, which are metal with rubber base.
Also, when I needed power conditioner for the amp, I spoke with Steve and got the Hydra2 recommendation from him. He said that usually, the Hydra2 is a good solution as far as power conditioners go for the amplifiers because it is not limiting current. He also recommended Running Springs Audio, but it is more expensive, so I tried the Hydra2, liked and kept it.

The Burmester 948 power conditioner is one of those hyperexpensive components that will substantially improve the resolution, noise floor and dynamics of most line level inputs but what makes it worth the investment is how it transforms the response of moderate power amps(~100W/Ch)regardless of topology into another realm. Purity of signal rules. Producing a mediocre signal loudly sells.
So what else is new?

My only experience is the present one : with the high quality swiss power conditioner probably nobody knows here in the USA, named "Boîte Noire Reference" (6'000$) I enjoy more the music with my Accuphase amplifier P-7000 plugged into it than into the wall.
There is possibly a slight loss of power (but with a powerful amplifier, it doesn't matter) but a richer, more articulated and less harsh sound. Better, no doubt about that.

What is your budget?