They're a difficult load, I wouldn't put tubes on them. For amps I'd look at Bryston 28B Cubed, Pass X350.8/X260.8, MOON 870A, Audia Flight Strumento 4, Accustic Arts AMPIII, BAT
VK-655SE, warmer and smoother SS in general.
For the remaining budget I'd pick a DAC that could drive the amps directly if you only listen to digital.
For the remaining budget I'd pick a DAC that could drive the amps directly if you only listen to digital.