Which speakers have the biggest soundstage

Hi all, I'm using a Cary sli-80 integrated amp with 40w. I want to upgrade my speakers. All I'm looking for is a huge 3D dimension but nothing else. Which brand would you choose from? My price range is within $3500 used and at least 92 sensitivity
IME, a speaker's dispersion pattern and cabinet design seem to dictate the character of the soundstage more than any other factors. Certainly not 100% of the story, but a BIG part of it. Mini monitors and planars both have their particular staging strengths, but IMHO, omnis tend to produce the biggest picture of all.

My soundlab m2's and dunlavy sc3's produced a large realistic soundstage for my listening room.
The new Magnepan 1.7s. They will play louder than you think with 40-50 watts of good power.
In my experience, most dipole speakers do an excellent job with soundstage. I've heard great examples with planar, electostatic and open baffle designs. This is a fundamental strength of most boxless designs. On the flip side these type of speakers (in general) have a harder time with bass and microdynamics. There is no perfect speaker. Pick your sound priority and find the speaker design that optimizes accordingly.