Easy to drive, outstandingly natural sound from 40-50 Hz up.....AN-E, O/96, others?

Mitch some great options listed here, I have AN-Js myself, but just wondering since you keep mentioning a 50 watt amp do you have a particular amp in mind? I took a look at your system, it's pretty awesome looking, as SS amps go I bet those Claytons are pretty sweet. You mention liking the setup so is the move downsizing or just curious to try something new?

I one owned a pair of speakers that sounded hauntingly beautiful with a low powered SS amp: the original JM Reynaud Ofrande speakers, made in France.  Absolutely beautiful looking and sounding speakers.

I ran these with an Atoll 80w SS integrated amp and it was a perfect match.  These just didn't work in my room (long wall, fireplace, couldn't pull them out enough into the room) but I can honestly say that these are the ones that got away.

There's a pair of Usher BE-10 DMD's on AG right now I think would fit the bill. they're big and heavy and have a look you're either going to love or hate, but they offer all the resolution we expect from a modern hi-end speaker and manage to throw a wide deep sound stage. musical and engaging, and sound really good right out of the box without hiring a crew to set up and tune your room for.

I like AN-E's that you mentioned and recommendations for the Spendor SP100.  I don't know what price range you are looking at, so as a broad mention of speakers that will probably work well with 50 watts, the following brands are worth looking into: 
1. Tekton (I heard their $3,000 model at a show and it sounded quite good.
2. Charney Audio--I've heard a $13,000 and a $17,000 model (same speaker with different full range driver) and both were VERY good, particularly the $17,000 model with the AER 3 driver).  
3. Rethm Bhaava--this is a $3,000 speaker with a wide range driver and a built-in powered subwoofer that sounds great for the price.
4. ProAc--I like a number of models in their lineup.  Although not that high in efficiency, their speakers sound quite good with modest power--must be easy to drive.  I particularly like the big D48R floorstander and the D2 stand-mounted speaker.
5. DeVore Gibbon X--perhaps not as low-power friendly as the O 96 Orangutans, but I heard them with a 30-watt Luxman integrated and the combination sounded quite good.

Good luck in your search.

wolf, out of curiosity, have you tried your Heresys on a stand to bring them up closer to ear level. I'm tempted to try them but the floor placement won't work for me. Thx.