Looking for ideas - new mono blocks for stereo music

By a good margin, the most transparent and open sounding amp I’ve had in my system was the Liberty B2B-100 made by Peter Noerbeck of PBN (my amp is a McCormack DNA 0.5 Rev. A). Liberty is his direct-to-consumer brand that benefits greatly from trickle down technology from his lauded Olympia amps yet are at a much more accesible price. This amp threw the most holographic and airy soundstage I’ve ever heard, which was likely aided by what seemed like a complete absence of background noise -- everything just appeared to be floating freely in completely clear, thin air. One of the really nice features of this amp is that it can be run in low- or high-bias mode. It sounds great in low bias but even better and more fluid in high bias, and although it runs a little hotter in that mode it’s still not hot like a pure Class-A amp. I left it in low bias when not listening and flipped the switch for critical listening so the amp was always warmed up and ready to play. Peter told me the amp sounds significantly better in mono-block form, which is saying something because this amp in stereo was quite special, and even in mono configuration the amps would only cost $6k for the pair. I’d bet Peter would grant you some form of a trial period if you asked, and given what you’re looking for I’d be shocked if you ended up sending them back. His amps are a well-kept secret in this hobby, unfortunately. Best of luck in whatever you end up getting.

@elizabeth those are some good suggestions - thank you. Especially the high gain idea is something I didn't even think of. And also the easiest to test :)

The duplex the Brystons are hooked up to is the Furutech FP-15A-N1 (R) while the power cords are GutWire G Clef 2. The ICs are Nordost Blue Heaven XLR.
So yes, there is some potential for upgrades but I don't really want to spend more on cables (also keeping in mind the state of the Canadian dollar) than what the amps are worth at this stage.

Consider if you do go for better cabling. You are talking about buying a $20,000 pair of amps.. If you did got big on cables, Think of it as being ready for that amp upgrade down the road.
If you have your amps set to low gain, get ready for a shock when you set them to high. It REALLY sound better ... Sure you lose a little volume knob. but WHO CARES!!                                
PS:how long are your preamp to amp cables?

Maybe these: http://6moons.com/audioreviews2/kinki4/1.html ?

My Kinki EX-M1 integrated sounds a lot like what you're after: detail and resolution. The designer of the amp studied extensively Swiss design and brings it to you at a very reasonable price. 

I'd take your time and research it. 😄

All the best,
Nonoise

I see two others have recommended checking out the PS Audio 300 mono's, and I'd agree that they are very much sonic contenders and worth anyone's hearing, but do be aware that they generate a decent amount of heat.  My room gets hotter from that pair than it did with a VAC Phi 200 (and sounds better in my system, room, to my tastes, etc.).  Also, they do use triode tubes on input, but that is a pretty easy tube usage to manage, nothing like power tubes.  I would not hesitate on that account (but I come from the tube end of the spectrum, typically).