If you can live with the practicality issues of that ARC 600 (ie size, mass, heat generation, tube life, etc) and cost (isn't it about 10x the JC1?), then go for it. For that kind of cash, I would have your dealer install it in your home for a trail listen. Then you can see if you can live with it.
Generally, I have found SS amps to be better for me (and I also own a pair of JC1s driving B&W 803ds) than EQUIVALENT priced tube stuff, this comparison is a whole new ballgame. Generally that is because driving my 803ds with an equvalently priced tube equipment means a lot lower power in the tube amp which results in lower dynamic range and transient punch. Where power is important (particularly with B&Ws and movie sound tracks), solid state is the cost effective winner. The ARC 600 takes the power issue out of the discussion, even if its not an apples to apples comparison.
Generally, I have found SS amps to be better for me (and I also own a pair of JC1s driving B&W 803ds) than EQUIVALENT priced tube stuff, this comparison is a whole new ballgame. Generally that is because driving my 803ds with an equvalently priced tube equipment means a lot lower power in the tube amp which results in lower dynamic range and transient punch. Where power is important (particularly with B&Ws and movie sound tracks), solid state is the cost effective winner. The ARC 600 takes the power issue out of the discussion, even if its not an apples to apples comparison.