In search for speakers of "natural" sound

We need a bit more to go on, specifically what are you unhappy with?

For instance: Audio Note speakers have a very direct and open quality compared to Harbeths which are a bit warmer, (to my ears of course), so if you find the 30.1 to be a bit too warm maybe some AN silver Es might be for you.

etc.

Otherwise we are chasing our tails with suggestions....

Wow Geoff, Fulton’s! I never heard the Nuance, but did have a pair of the earlier Model J, which replaced Magneplanar Tympanis. The J’s had the great RTR ESL-6 tweeter array, a transmissionline loaded woofer, and Fulton’s Model 80 2-way as it’s midrange. Great speaker, $1200/pr in 1974.

I think my Klipsch Heresy IIIs have a surprisingly "natural" sound with my tube stuff, and I have instruments around as a reference as well as a long career as a live concert sound tech, musician, and fashion model (not a public one, just me around the house wearing my own crappy clothing). However, I wonder if it's reasonable to use yourself as a reference as really, what the hell do I know? A good reference is to make a clean recording of the ambient sound outside, play it back on your hifi rig blindfolded and then try to determine where you are...this requires plugging your nostrils so you can't smell anything.

Thank you everyone, I truly appreciate your experience and advice. Now, I know where to go from here,  I guess I will look for a used pair of AN silver E or open baffle speakers.

Best,
Huy.

You should look at Revel and read this book by Dr. Floyd Toole:
"Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms".
The concept is you want speakers that measure flat on and off axis. 

All of your other equipment measures flat, why would you want speakers that don't?