@atmasphere , those Hartsfield loudspeakers bring back some great memories. When I was a kid I'd take the trolly into Harvard Square where there was a store called The Audio Lab. They had the best used department. I got my TD 124 there.They also carried JBL and they had the Hartsfield speakers on display and to my young ears they were incredible. I thought they sounded better than K Horns. They were much more aggressive and in your face driven by Marantz Model 9's.
The Classic Audio Loudspeakers T1.5 look like very nice speakers but at $72,000 are pretty steep. In comparison to Wison or Magico speaker they are probably a great value. I have never heard a pair but at that price I would certainly travel to hear them. Which model do you own?
For 15K I would go with the Klipsh Cornwalls and subwoofers. 18 watts will give you a severe headache and the limited dispersion is IMHO a huge benefit.