Agree with others about room size, more power is better and with the low efficiency of the Sound-Lab big amps are a requirement.
My room is about 5600 cubic feet and with the Sound-Lab Ultimate (a bit less efficient than yours), the three amps that got dynamics and volume correct were Atma-Sphere 200 watt, Tube Research GT-400 and VTL 750.
The Atma-Sphere and VTL are very reliable, can't say the same about my experience with Tube Research. Hope you're able to find a match that makes you happy.
My room is about 5600 cubic feet and with the Sound-Lab Ultimate (a bit less efficient than yours), the three amps that got dynamics and volume correct were Atma-Sphere 200 watt, Tube Research GT-400 and VTL 750.
The Atma-Sphere and VTL are very reliable, can't say the same about my experience with Tube Research. Hope you're able to find a match that makes you happy.