I would look for a used pair of JBL 4435’s. I own a pair, great 3D imaging and wide soundstage. See review below and tech manual for JBL 4435’s:
It's been over 30 years ago since I last listened to the JBL 4435's and their smaller siblings, the 4430 (some years earlier, around 1980, I remember listening to a pair of Yamaha FX-3's - also quite impressive monitors, for a pair of young ears not least). Those were also the days of the Everest DD55000 and K2 S9500, and of the four of them I favored the K2 S9500's for their outright dynamics, coherency and MTM configuration. Indeed at the time they were my dream speakers. I'd have cherished listening to them actively configured - to think it would have made them even more dynamically astute, and resolved sounding.