Heresy IIIs and a couple of REL subs does the trick for me. And my single ended tube amp has only 4 tubes so tube rolling is inexpensive (and fun, my preamp has 4 matching tubes but not expensive). Note that before I started looking around for efficient speakers to match my amp, I hadn't listened to any Klipsch speakers for years...I found that the Heresy IIIs had none if the drawbacks that horn critics famously have issues with, and each is a coherent and revealing little powerhouse even with less power. 99db efficient...yeah man...
