Another vote for Vandersteen Quatro Ct.
Also Legacy Audio Aeris will provide a big, open, sound.
Since you've owned the SF for so long I'd expect your ears/brain to prefer the SF sound and other brands you try might sound different or exciting but after extended listening you'll find the sonic differences to be flaws, so I vote you stay with the brand you've been enjoying and go up the line. Bigger sound, less compromises with the same attributes that attracted you to the brand in the first place.
I would not expect that just because you owned and liked a speaker for a long time you would perceive differences as flaws. That has never been my experience. I have heard a lot of speakers in between purchases… some sounded incredible (but not ones I wanted) some sounded incredible and sounded more like what I wanted. So, I changed brands.
For me, I appreciated lots of different speaker systems, bought a few. However, for me, Sonus Faber has a realism and musicality that is far superior to others. So for me that is true… but not because my last three sets were SF, but because they perfectly fit my desired sound characteristics.
If you haven’t made a decision look into the Charney Audio Concerto. A large full range single driver horn that fit your budget and deliver! Full scale engaging sound that bring the artists into your room. I just upgraded to the Companion with Voxativ AF2.6 drivers for my 11x15x8 room and couldn’t be happier. Charney’s demo room is 14x19x9 and the Concerto sings beautifully in the space. Look them up worth the listen.