That's funny you sold the Art Audio. There is one RV owner on the Reference 3a circle and he has an Art Audio SET amp and absolutely swears by it. As for needing a lot of power, I've tried many amps with my MMDCI's and they don't need much power at all. In fact, the most beguiling sound I've heard from them was with a 1.5 watt SET amp 2A3 based. The worst I've heard was a Unico hybrid integrated and I heard a Plinius high output SS integrated, which was pretty good, though not as good as my own VTL monoblocks or the 1.5 SET I heard with them. You will probably be giving something up by going solid state from the Art Audio, but you've got to compromise if you want both home theater and audio, especially with this speaker brand.
Michael