I've tried the Simaudio Moon I-5 and Electrocompaniet ECI-3 with ProAc 1SCs and feel that they definitely prefer being driven by tubes. My current system includes a solid state BAT VK200 amp, Kora Hermes tube DAC and a Blue Circle tube preamp. I've used this set up with Response 1SCs and Response 2.5s, and it's allowed me to enjoy the midrange of tubes along with the control and power of solid state.
I think the VAC Avatar is an excellent place to start your search. Who knows, it may end right there!
I think the VAC Avatar is an excellent place to start your search. Who knows, it may end right there!