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Just gonna chime in on this RA-1 thing here.
It's a fine amp for the RS1, but if you really want to take an RS1 as far as you can you'll want to get a Melos SHA-1 or SHA-Gold. I hear the MAD Ear + and its relations are fantastic matches too.
Of the three, I found the SHA-Gold and Ear+HD about as good as it got with the RS1s. The RA1 was nice (owned it too), but not on the same level IMO.