My experience with Arcam and Nad is that Arcam tends to be a little more articulate and refined while the Nad delivers more current /power and has better drive.
Both are a touch warm sounding.
I have not heard your speakers so I wont make a reccomendation.
I too have 1cs and they are very easy to drive. Right now I am using a CJ CAV50 integrated at 45 WPC into 8 Ohms. This is plenty of power for them. Arcam, Outlaw and NAD will work fine, just a matter of personal choice. You might also want to consider Musical Fidelity and Bryston.
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