I am using the Prima Luna PL 5 power amp (similar specs to PL2 integrated) with Opera Plateau floorstanders and love the combination. Running EL 34 power tubes. Opera and Sonus Faber are voiced pretty similarly. I think you will be fine with the PL1. 600 Eur for the PL1 is a good price for mint condition.
Best regards,
Rich
Best regards,
Rich