Two good stereo amp possibilities might be Seymour Duncan Powerstage 700, and Camplifier SHP.
I've got a non-powered rack and the stage. I use the Powerstage 170 into an old Peavey 512 cab and love it. At home I run through a pair of Neumann KH120, but the Powerstage is an excellent choice when using a non-powered Kemper.