Paradigm 3f, KEF reference 3, Monitor Audio PL300II

Loudspeakers are a personal choice. So it's best not to rely on others experience. This is what I learned in the past 2 years looking for loudspeakers. Nevertheless, I have listened to all the loudspeakers you mention in the past several months.
All the loudspeakers that are on your list - I could live with them without any issues. The KEFs and Monitors are accurate loudspeaker and can be as neutral as a PSB Imagine T3 with the right ancillaries. I highly encourage to find out a dealer and listen to the Paradigm Persona 3F/5F. They are amazing loudspeakers. I demoed them in a "not a good setup" and they really sounded good. So, if a right room, they will have the chance to shine. I found the Sonus Faber to be a bit too warm for my preference.
If you get a chance, try to locate a Spendor dealer and listen to a D9; I think you will like them, even though they are priced below your budget.
What are your room dimensions and the equipment you would use to drive the new loudspeakers? What is your current setup?

So Puli and Stebrn, are one and the same?

But you have a nice sized room and equipment. Good luck on your loudspeaker search. You will not go wrong with any of them, on your shortlist.

Puli we sell both the Personas and the Kefs, and we sell the Legacy as well, and we sell PSB, and Daili amoung other great speakers.

The Personas are faster and more transparent then the KEF's with a more precise and holograhic image they tend to sound a bit smaller than the KEF
s or the Legacy's. If you love transparency and realisitc imaging the best. 

The KEF's tend to sound a bit bigger and have a wide soundstage, the speakers are not a transparent. These create a slightly less transparent sound but sound a bit larger good bass and dynamics a great overall speaker and fantastic for home theater. 

The Legacy's Focus plus a Wavelet Dac/Preamp and room correction processor will make a stock pair of Focus XD into a pair of mini Aeris which will give you a huge soundstage, very deep tight bass and a liquid midrange and treble. This package around $17k is a game changer for all you need is a power amp and you have one of the best all around packages in audio. 

Not as holographic or transparent as the Personas, but big, room filling, superb deep tight bass and with a Wavelet totally free from room bloat or boom. 

Please feel free to reach out to us via PM if we can be of further assistance. 

Dave and Troy
Audio Doctor NJ

Thanks again for the advice. I just heard the Parnadigm Persona 3f and was very impressed by the imaging, soundstage, and feeling that the performers were standing in front of me.  The KEF Reference 3 and Monitor Audio PL300ii were at the top of my list but now I'm favoring the Paradigm. The dealer is going to have the Paradigm 5 set up to compare to the 3 when I go back later this week.  It's great that the 3f is a third less than the KEF and Monitor Audio.  I'm not sure it will be worth 70% extra--the price difference between the Paradigm Persona 3 and the 5--to get the additional bass. Seems like a huge upcharge for this.  Listening will tell.