ProACs require Audio Research amplifiers and preamps. Stuart Tyler admitted he uses ARCs to test his jewels. That's all.
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Curio, have you even heard the 2.5s? There is no way that ProAc "requires" AR amps. Even ProAc frequently demoes their gear with Cary SET amps. My dealer uses Naim, but it wouldn't be my first choice. Soundstage reviewer Mark Mickelson liked Lamm with his response 4s, but also said "It’s important for me to mention that the Fours have worked superbly with all of the equipment I’ve had in for review." As for me, I use my 2.5s with a Pass Aleph 3, and I have talked to others who like this combo as well.
Hgeifman: Buy what sounds better to you. You may also want to consider how the speakers sound with other amps. Sonus Faber isn't renowned as an amplifier manufacturer. Also, I have never seen anyone match Proac and Rowland (not that it would be a bad match). I think you are on the right track, both of those systems are very good.