The best speaker you ever heard?

Aerial Acoustics 8t. Driven by Audio Research VT 100 tube amp, with Audio Research LS 15 preamp. Source material was a Proceed HDCD player. Amazing setup - soundstage went on forever, imaging, dynamics just like a live show. There was a Rega or Rotel (I forget) turntable there but it wasn't prepped and hooked up the day I was there, a true crime! This was about 7 years ago, at Mission Audio's demo room in Santa Barbara, CA.

Avantgarde Duos - liked them enough to sell my Wilsons.

Previous high end speakers owned - Apogee full range, Kefs, Infinity, and the Wilson WattPuppy 5.1s
Speakers recently auditioned before I bought the Duos:
Avalon Eidelon, Vandersteen 5s, JM Utopia - liked them all, but not as much as the Avantgardes.

My current system - CJ16LS, CJ15 phono, Cary V12, clearaudio Master Solution/Benz refSilver,Synergistic Reference Cables, Wadia 16i

for an office system, my sonus faber concertos simply became my friends, not the "best ive ever heard," just simply never got tiresome, and now im trying the dali helicon 300's.... anyone got an opinion on them? so far they seem "more" but not necessarily better... but then for an office system maybe im being really picky.. cheers

Let's not forget stacked Bose 901s!

Will stack my two sets of stacked Bose 901s (Series IV), with Technics Class A amp, Advent (Apt/Holman Design) preamp, high end CD player, and middle road interconnects against almost any speaker competition. I know it defies convention, common sense, science and the state of the art, but I cannot begin to count how many times I've felt embarrassment for friends when we do a listen-to-listen session, with their Wilsons, Magnepans/Magneplanars, Dalis, Veledines, Krell ref subs, Agogees, Klipches, Vandersteens, Avante Gardes, VPMSs, et al. And it doesn't matter the room, acoustics, source material or volume. I look you in the eye and say get the 901s before they are discontinued...the best buy and physics defying phenomenom out there!

Eidolan Diamonds at Goodwin Sound in Waltham Mass. Blew me away.