If you want "blunt, I’d pass on all of the tube amps on your list, and ditch the Benchmark DAC, I had one and could not stand it. One of the most un-engaging dacs I’ve owned.
As for your speakers, and this graph, (and I’m a 100wpc mono tube amp owner myself) I’d be looking for a nice velvety 200wpc mosfet solid state amplifier. I think you’ll be much happier and your speakers deserve the right matching amp imo. 3.5-4.0 ohms is just getting too far down there for most tube amps. The amps I’m using right now would do it, and so would KT Monos yet I’d throttle expectations after seeing this graph and considering what tube amps you might need.
Worth checking the used market for nice SS mosfet amps (too) if interested.