Need a new amplifier. Need a good match for my Audio Research LS7 preamp

Speakers - B&W CDM-7NT

NAD CD Player

10x12 room

SS or Tube, New, or used.  Looking to tame a little top end brightness, and more clarity at higher volume.

Mostly Classic Rock, Reggae, Singer songwriter stuff, with a smattering of Jazz and Bluegrass.  Lots of ground to cover. 

Current amp was an Arcam Alpha 10 100wpc.

Looking to spend around $1500.

Saw a used Odyssey Khartago Extreme for under $1k, but don't know much about it, other than needs to be biased to your homes electric output, and had some real good reviews. Sounds a little finicky.

Appreciate your input