My song towers sing with Rogue 99 pre amp, Rogue stereo 100 power amp. prior to that Anthem and Krell solid state integrated amps, I did not find as musical.
i would consider Rogue, AVa, Primaluna, Line Magnetic.. Reasonably priced tube gear with slam and control like the Rogues.
for a budget Hybrid integrated, the Rogie Sphinx is hard to beat.