I'm surprised no one has mentioned Alon. The Model I has stellar imaging that casts a believable soundscape. The dipole midrange mounted on an open baffle must be playing a role here. The box enclosing the 8 inch woofer is quite narrow which keeps diffractions to a aminimum.
The Totem Arro, Sttaf, and Mani-2 also deserve mention. In terms of currently available, affordable speakers, they're especially noteworthy. They disappear without much trouble.