Which 300b amplifier for Devore O/96


I am looking to upgrade (and simultaneously downsize) from Coincident Frankenstein Mk2 300b SET monoblock amps to one of these stereo amplifiers.

These are the four candidates so far: Nagra 300p, Luxman MQ-300, Wavac EC-300B, Air Tight ATM-300R, Shindo Cortese 300b

My preamp/dac is Bricasti M12 and my speakers are Devore O/96.

I am not looking nor interested in any other 300b amps at this point.

If anyone has compared one or more of these amps (esp on an Orangutan) do chime in.

Where I live I can probably demo the Nagra and the Air Tight but nothing else.

Thoughts?
essrand
There was just a pair of Haut Brion's on Audiogon/Audio Mart in the past week or so...reasonably priced.
So I have to redo my list now and make sure I get at least 20-30W in my amps. The options are now limitless with PP tube amps.

New List (as of now): Nagra 300p, Kondo Overture (used only, can't afford new), Shindo Haut-Brion (if I can find one).
@essrand I'd go for a bit more power if I were you. The trick with any amplifier is you don't want to work it hard- its lower distortion and power tubes last longer. BTW as you may have surmised our M-60 works quite well on that speaker.
An update on this:

I am in NYC, probably the only city where I can demo almost all of the mentioned above amps.

Current candidates are:

Engstrom Arne
Shindo Cortese
Air Tight ATM-300R
Luxman MQ-300
Kondo Overture I

So far I have heard the first three (impressions to come soon).
Two more to go.

Esstrand,

I look forward to reading your listening impressions of this  list of very fine amplifiers.Any one of these amplifiers is capable of excellent sound quality/performance if paired with an appropriate speaker. I’m sure you’re enjoying this experience.

Charles