Go with Naim.
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I suppose that Linn Majik i drives 1sc rather good for Vocal and country Music but If you like Symphony or other with many musical intrumments, it makes you disappointed cos' its poor dynamic. Naim 5i is better but expensive. For my experience, I recommend Creek 4040s3 for all types of music with full satisfaction at lower budget.
Go with Naim. I have owned older Arcams and listened to the Naim XS. If you want crisp sound, fast transients, and good pace and timing, the Naim will give you that. There are many users who love the the musicality of Arcams. The Arcams will be soft-sounding in comparison with reduced macrodynamics. I never liked the Arcam sound, just not to my taste but they can sound good in the right system. No experience with Linn.
For Proac 1sc you might want to consider tubes. Read that the 1sc sounds fabulous with tubes.