ATC is way overpriced compared to the sophistication of the KEF and Ascend, which are much more modern. Consider a small floorstander with the same footprint as these speakers on stands, like the Focal Aria 926/936.
If you consider the Focals, I'd also suggest also checking out the new Focal Chora 826 towers; they are just $2000 a pair, and I believe they are actually cheaper in Europe. The 806 bookshelf at least measures nearly identical to the Aria 906 equivalent. I imagine the tower would follow suit. Purely conjecture, but it's generally the case.
@jinithin, might be worth considering since you liked the S200 over the S400. Maybe you just prefer the wider directivity - which the Focals have. I'd consider the S400 and R3 more similar than different from my recollection.