I dislike applying the adjective "Best" to anything (except J.S. Bach and The Band ;-), but I’m with ya George. Hearing my first ESL’s was a game changer: the Infinity Servo-Static I and 2000A, the ESS Trans-Static I (a pair of which I now own), the RTR ESL6, the Fulton Model J (which I bought new), and finally the original Quad (also now owned). Cones were dead to me. Then The Magneplanar Tympani---finally, life-size instruments and image height! Plus cut-from-the-same-cloth timbre reproduction, and very low coloration. Not as transparent as ESL’s, but ya can’t have it all.
There is a loudspeaker available now with the widest-band planar driver I know of---the Eminent Technology LFT-8b. The dual-LFT magnetic-planar drivers (a push-pull design) cover 180Hz to 10kHz, with NO crossover! A ribbon tweeter comes in for the top octave, and an 8" dynamic woofer in a sealed enclosure does 180Hz down. With a pair of real good subs (Rythmik, the OB/Dipole model if you’re very serious) added, you have a killer budget system for under $5,000 total.