used power amp under 1500

Another vote Aragon 

I can only go by what I see

• Aragon's web site has no prices and links to resellers who don't list Aragon on their website
• Schiit website has a weird tone, we are not friends, don't list insulting questions/put questions in my mouth that make me look like an arrogant, ignorant jerk. You can make your points without assuming the worst about the customer

It does not mean that they couldn't be great amps, just makes me a little cautious. 

I like the Rogue idea.

You might consider Van Alstine.

Considering your price range:

New: https://avahifi.com/collections/power-amplifiers/products/np1-power-amplifier

Used: This: https://www.usaudiomart.com/details/650276264-audio-by-van-alstine-vision-set-400-stereo-power-amplifier/ 

or this https://www.usaudiomart.com/details/650280745-audio-by-van-alstine-ava-vision-set-120-power-amplifier-single-ended-transistor-amplifier/

Belles: https://www.usaudiomart.com/details/650263524-belles-reference-150a-v2-tm-upgraded/

Lots of good amps at your price point. You can contact Schiit customer service and skip their AI...The original Aragon Company  is long gone ( I had the 4004 MKll and it was great)....be careful about buying a 35 year old amp...

PS Audio S300 can be had for $1K range.  Quad Stereo for around $1.5K but they are hard to find. Used Bel Canto