It's matter of taste but I don't think the 25 watts will drive. I would go with at least 100 watts tube and 150 watts solid state for the 3 a sigs.
I found that my old 100 watt tube amp was not up to the task but my 160 watt monoblocks were quite a good match. They like power to show off their lower bass.
I found that my old 100 watt tube amp was not up to the task but my 160 watt monoblocks were quite a good match. They like power to show off their lower bass.