Really need some help finding a full range speaker


I've thus far been on the sidelines here, but I must say I've been very impressed with the knowledge many of you bring to this forum . I'm hoping to tap that knowledge, if I may, and get some help finding a new pair of speakers.

I currently have a pair of Paradigm 75f's and I've been very happy with them. To me they sound neutral, fairly accurate and exciting to listen to. But with just a pair of 5.5" drivers providing bass, they are lacking seriously at the low end.

I"m driving my Paradigms with a CJ LP70S which puts out 70 watts per channel. It has no trouble driving the 75fs but I'm inclined to buy a more efficient speaker this time around. I"m also very interested in maintaining or even improving on the accuracy and neutrality I"ve been enjoying with the Paradigms.

I'm searching in the used market and looking for a pretty significant upgrade. I'm very open to vintage options and am searching in a fairly wide price range from $1500ish (used) up to around $5k. I'm concerned about not having the opportunity to demo the speaker before I buy it, but am highly motivated by the cost to value ratio available with used speakers.

One final concern is size and aesthetics. My wife is simply not going to tolerate a tower speaker bigger than she is (or I am for that matter) and more flamboyant designs are not welcome in the listening room that doubles as my living room. I'm hoping to find a fairly straightforward looking speaker that's large enough to accommodate bigger drivers but doesn't completely overwhelm the room with their size.
thebrokenrecord
yeeesh... too many good/great choices $1.5-$5k used or new, you can even choose a used Klipschorn!  

Choosing a high-end speaker without listening first is pretty tough, like buying toilet paper during COVID.  So I'll try to stick to "safe" choices:

ELAC - designed by speaker designer Andrew Jones (TAD, Pioneer).  Best bang/buck reputation.  Consistently positive reviews.  Frequently puts out new speaker models.  The  ELAC Adante AF-61 got good reviews and is now half price at $2.5k - I suspect to make room for newer models.

KEF - I listened to the KEF-LS50, which a very large number of positive reviews, and compared it to the R700.  To my attentive untrained ears they generally sounded/voiced the same with the exception of more bass for the floorstander R700.  You can get the R700 for $3.6k, the newer model R7 for $4k.

GoldenEar - Triton series got great reviews.  Designed by industry great Sandy Grossman (just retired).  Great bang/buck reputation.

Monitor Audio - Gold 300 $7k.  Although I've never demoed these speakers, I did demo their upper tier Platinum 300 series and I was very impressed with the sound and the solid build quality which punches significantly above it's price point.  I know that the Gold 300 has garnered multiple positive reviews including Stereophile.  For me, the Gold 300 is one of a handful of speakers I can purchase without demoing but confident it would meet my satisfaction and beyond.


if if you can get Daedalus speakers as dodgelum has suggested you will be set for life A pair of Rel subs would also help in getting the very low end if you are looking at the 23HZ to 24Hz my Poseidon will go lower than stated 28Hz bottom & my Rels S/812 will go down to 19 Hz but I have adjusted them for a perfect blend at 24Hz 
I use Sonus Faber Sonetto V and they are $5k - right at your upper range. 
I’ve upgraded from Sonus Faber Venere 3.0 and was exploring other brands. I preferred the sound. 
I think $5k can buy an amazing speaker.