Hidden Gems in Pre-Owned Solid State Power Amplifiers?

One incredibly refined integrated amplifier built in Italy and 
selling at under $2500 is a steal the Audia Flight Three S Integrated Amplifier it is very conservatively rated 100wpc into 8 ohms ,and over 160 into 4 ohms . My friend is driving his Big
Maggi 3-6 which are like 84 dB efficient , the current delivery on tap is hard to believe this $4k integrated can be bought for under $2500 is by far the most refined, powerfull and very natural weight 
I am strongly considering buying one ,for tube integrated the 
Ayon Scorpio at under $4k has not much competition for its sonics and build quality and 40 wpc and a  very powerfull 45 wpc in pure class A pentode with -0 negative feedback And constant microprocessor  tube monitoring 
and build is second to none using choke filtering power supplies 
pure gold plated berrillium copper tube sockets , these 2 products 
best in class stated around the world. 

N.E.W. Nirvana Electronic Works A20....sweet sounding class A amp

@avanti1960 --

I would look for the Crown Studio Reference I/II. They have a build-in fan, yes, but it will only "go off" when you really push the amp - and believe me, the Studio Ref's barely break a sweat, and when they do they can take it, hour after hour (and the fan shuts down immediately when you lower the volume from high power use). Forget about it being a pro amp build for studios (that is, to me it's typically a good thing); a great amp is a great amp, and the Crown Studio Reference is exactly that - build like a tank for hard, constant use with no frills to cater to a high-end milieu. Personally I love the industrial look and its understated elegance - a beautiful amp, I'd say. The sound of the Studio Reference is effortless, unetched, with a natural tone, great soundstage and overall composure. It just doesn't seem to get in the way of the music with any obvious signature of its own. 

The old Nakamichi 420 is a really excellent sounding little power amp.