ARC VT-100 (I have the Mk. 2) is magical with the RS-1bs: liquid, huge, airy soundstage. They were originally designed with Conrad Johnson tube gear, BTW.
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I own Infinity RSIIa. Almost the exact same 'cept you have slightly better woofers, stronger EMIM magnets. I use a Forte' 4a 50 watt per channel amp and it is fine. Rewiring the speakers with Audioquest Midnight wire helped a lot. Did that rewiring 7 or 8 years ago. A tube amp IS the way to go BUT you have to be prepared for the extra expenses a tube amp will entail. There ARE solid state amps that can be used, like my Forte'. Some of the new Bryston amps might be good. If today I had to replace my amp, Bryston is what I would look at first.
Also the little box (that comes with the speakers) to go between the pre and amp (for bass control) can be helped by putting in really good RCA jacks. The stock ones a super-cheap junk. I used Kardas Silver RCA jacks.