Good imaging requires very low coloration, accurate f.r., and phase linearity. For 2K you are not going to find a new full-range speaker that provides this.
You could look for some used ATC speakers, Or get the ATC SCM 11's and add a sub later.
Sound Stage and Imaging
I love speakers who 'paint a big picture' (I am literally closing my eyes and trying to SEE a picture). Therefore I THINK I like to see IMAGING and BIG SOUND STAGE. And also like DYNAMICS.
Being frugal (just not willing to spent audiophile level money on it), I love to persuit 'bang for buck' solutions in general.
With above goals in mind for a speaker: what hits the marks in the low fi (audiphile scale) $2k (used or new) budget range. (I have 2 setups: one HUGE room, one 20x20).