Are Pass Labs amps probably the best ever you can buy ?

I like Nelson Pass. His stuff is good. Are and Spectral stuff is better. If you are going to spend in that range. You owe it to yourself to listen first.

You may want to consider Krell. I’ve had several models pushing B&W 802 and KEF. Currently, I have Krell’s 575 Solo coupled with Martin Logan 13a. A reason I mention them is that they just upgraded their line, “XD”, which has been well received by both Stereophile and Tone Audio. Like Pass, friendly and great service. 

@cakyol The cost of the amp does not quantify the improvement in sound you are getting. If class A/B is what you are considering then getting a good implementation with first 20 watts of class A into your speaker given the impedance would be nice. The rest can be class A/B, make sure the amp never reaches clipping. Some speakers need high current and good voltage swings, so amp that can do that is what you should consider.

I was looking for same and was considering the significantly less expensive and some not so famous amps by Coda, Odyssey, Parasound, ATI and ATC P2 etc. 

I did settle for Benchmark AHB2 however. 

I would wager that if you level match the above amps you may not hear any difference at normal listening levels. My preamp is Legacy Wavelet which is more expensive than the amp, it comes with room correction and are integrated to work well with Legacy Speakers.

only one mention of PS Audio.
does this brand have no love here?
i am in the saving mode.
when i get closer, PSA will be on my radar.

If you got $15,000 to spend I would highly recommend the PS Audio  BHK-300 mono amps and their matching pre-amp.  The sound this combination makes is in my opinion the very best bargain in all of the high end.  Best of luck.