+1 @lalitk on SPL
Their stuff is powerful, dynamic, clean, holographic while balanced, yet still super nuanced. I’ve got the Elector pre and have to say that I’m enjoying everything from chamber jazz to AC/DC with two different amps used so far. Something about that high voltage rail tech they’ve designed.
Elector pre + Performer s1200 or Elector + s800 (budget option). They also have incredible mono amps. But looks like you want to stay with an integrated and hope I’m not colluding the discussion!
I do need to add, however, that those Piegas are sensitive enough to not need too heavy a wattage amp. You may not need so much wattage to drive them to concert levels, and that current via power supply and capacitance delivery (both in speed and sustained demands) by design is way more important than overall wattage. But wattage does help. My uneducated guess, at least 120 watts per channel would be fine if the amp is down to 2 ohm stable.
Also, are the Piegas floor-standers? And what’s your room size?