It all depends upon the demands you place on the speakers and the room you place them. If you like intimate sound, you want line arrays or Horns or a very padded room. I you want large sweet spot, then you want point source speakers. If you want clean authentic bass below 35 hz, then you want a form of acoustic suspension speakers. Horn speakers just down't work well below 35 hz. If you want huge dynamics and you don't like horns that leaves line arrays, with big power, If big power is out of the question you are stuck with horns. In the Altec family my favorite is the 604 used in Urei monitor speakers with the supplemental 15" woofer and the unique crossover allowing time alignment. Its efficient, and has faithful reproduction as a studio Monitor from 30 to 18,000. Its competition from JBL is the 4435, another great monitor speaker. To get the octave below these speakers you need Macs multiple woofer speakers and big power. You can stack AR-3'a, ML-1c, etc and go for it. My favorite was stacked ML-4c pairs, or XR290 with 5 to 600 watts per channel. A Urei with 150 watts was easily a better choice for most folks. 3 pairs of Stacked AR-3a's with 300 watts a channel is great sound, too. Afforable Wilson, Thiel, KEF,B&W, Canton, can make for great sound, . But they are Dynamically challenged. Some Tannoys can be very surprising, in some ways surpassing the 604 and like wise just as efficient. There are a lot of new speakers out there that can surpass the speakers above. But not only do you need big money, but it seems you need big power. $$$$$$$$$$$$ . I use to like Acoustat electro static and early Magnepan ribbon speakers for realism, with 150 watt tube amps. Of course I had to sit close and give up bass and dynamic range, but then it was amazing sound. Apogee in the right room were thrilling, too. But for my type of listeing, I'll stick with line arrays. Infinity seemed to have right ideas and the right direction, but their execution left me to confused, to enjoy. I loved the last series of Snell speakers, its a shame they fell into the acquisition trap. Te best tweeter I've heard belongs to Magico, and their mids aren't bad, the woofers top octaves have serious issues and the costs are horrendous. In the 70's B&O use to contract with Celestion to build speakers. They were a great realistic sound reproducers for smaller spaces.
For a different private listening experience try Stax ear speakers.