Amplification for Wilson Audio Sasha on the cheap

It always tries to stay in Class-A without the heat penalty, unless you play Black Sabbath for the whole album at max level then it's going to get hot. But if you play quiet Chamber music, it's going to stay lukewarm. 

Cheers George 

That one Krell FPB-300c is Class A?

Sort of, without the big heat penalty.
As it has what’s called sliding bias or plateau biasing (class-A), which in layman’s terms, means it monitors the input music signal and raises and lowers the class-A bias automatically of the output stage accordingly.
So there no wasted time and heat in class-A when there’s quiet passages, low volume or no music signal.

Cheers George

Here's a big Krell in Au. I'm sure he'll let it go cheaper, offer $5.5k.

https://www.gumtree.com.au/s-ad/como/stereo-systems/krell-fpb-300c/1123208940

Cheers George 

The ME sounds phenomenal but what I want to know which reasonably prices amps can sound better.

There maybe amps that can sound better at a reasonable price, but they may not drive speakers such as these Sasha's in the bass like the ME can.
But if you take the word "reasonable" out then yes there are amps that sound better and can drive the Sasha's as well. Parasound Halo JC1 Monoblocks come to mind, big Gryphon's ect.  

Cheers George

Have heard Sasha's with ARC Tube Amps and they sounded very nice indeed.

Like I said before:
  "Sure a tube will work and mostly sound good, but the best will not be extracted from the Sasha's in the bass."

Cheers George  

I have heard the same too, so a decent tube amp can keep the bass right and get the low freq?

Stereophile bench test:
" On the other hand, the Sasha's plot of impedance magnitude and electrical phase (fig.1) reveals the speaker to be a demanding load for the partnering amplifier to drive. Not only does the impedance drop below 4 ohms for most of the lower midrange and upper bass, with a minimum value of 2 ohms at 86Hz, but there is also an amplifier-unfriendly combination of 3 ohms and –43° phase angle at 61Hz."

Lower bass if you want it kunalraiker clean, tight, rhythmic and punchy, you'll need an amp with current, sure a tube will work and mostly sound good, but the best will not be extracted from the Sasha's in the bass.
That 3ohms with -43 degrees of phase angle will look like 2ohms to the amp that's driving them.  

Cheers George 

I currently have a ME850 amp

I own 2 of these amps active bi-amped, and I can say one will drive the Sasha’s without even yawning.
If you need to sweeten it a little get a tech to bias it up a little more from 8w Class-A to around 12-15w, fan are speed controlled according to heatsink temperature, but this is still dead quiet unless you put your ear up to the intake vents.

http://www.me-au.com/me850data1.jpg

Cheers George

https://www.stereophile.com/images/archivesart/710Wilfig1.jpg

2ohms in the bass power region with some - phase angle as well, is a hard load, these speakers need an amp >100w with good current delivery to get the best from in the bass.

Look for an amps that "can almost" double their wattage from 8ohm to 4ohm and again to 2ohms.
Old big heavy Krells come to mind for s/h, and for new Parrasound Halo JC1 monoblocks.

Big amps with bi-polar output stages, I would say first like the above, then mosfets, last tubes.

Cheers George