I have not heard the RS6, but spent time with the S2. They were driven by my audio refinement complete integrated, which I loved. So, you could try that, or maybe the small YBA integrated.
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I have heard the RS6 and like them a lot. Given the nature of the RS6 speakers - I would look at a slightly warmer to neutral amp - like the YBA, NAD C372, new C375BEE or C355BEE, Unison Unico. Try the Cambridge with the RS6 before you commit to the paring. You might even look at a tube amp like the Onix Melody SP3 or Jolida 302RC...
I owned a pair of RS6 for a while. I would recommend a warm amp with powerful bass. The weakness of the speakers is that their bass never really comes out into the room to create a soundstage foundation, unless you have very good power in the bottom end.
If you can snag a Marantz PM15-S1, that would be a great combo. I used mine with a McIntosh MC7200 and it worked great - way better than a CJ MV55 did. Unison Unico would be a great choice as well. I also had a NAD C720BEE and would not recommend it, or similar, for these speakers because the top end would overpower the bass unless your room is tiny.
Not exactly a fair comparison for the NAD 720BEE to their three hundred series integrated's with respect to bass control and presence. The 372 and 375 have three times as much power (150W X 2) as the 720 receiver (50W X 2), and can lord over most speakers better than any other integrated amp I know of for under a grand. Now you still may not like the neutral to warm presentation, but the woofers will be pretty much doing what the amp asks them to do in real time.