There are two pairs of 1Cs in my home. One is part of a modest home theater system in the bedroom and is powered by an old 60wpc AV receiver. The other is part of my son's system and is connected to a 35wpc NAD integrated. The receiver has more wallop but the integrated sounds sweeter, particularly with female vocals (a Vandersteen strength in my opinion). However, I have also connected a pair to a 100wpc tube amp in my main system and they sound stellar there. I would, therefore, recommend that you find an inexpensive tubed integrated because these speakers LOVE tubes. I've heard that Cayin and Primaluna make products that should work well in this application.
Good luck!
Good luck!