Are the speakers, box, ribbon, horn, or electrostatic? And the sensitivity?
The amp must be able to drive the speakers, so that would be a significant consideration. I'd go with an Aesthetix Mimas (around 9k), as it has tubes in the preamp and solid state as an amp, and it doubles into 4 ohms, so that's 180 watts into 8, 360 into 4. I might opt for something (an amp) that was 6k, but my experience is that everything needs to be equally good. Whatever is the weak link in your system will prevent the other components from showing them at their best.