My speakers are PBN Montana EPS2s, Mariasplunge. A very musical pairing, IMHO. Definitely not monitors, though. But why are monitors a requirement? The EPS2s are big (as are many comparatively efficient speakers), but they play pretty close to boundaries, a variable that has as much to do with practicality in living space as size, IMO.
My room is almost exactly the size of yours, by the way, in an "open floor plan." My critical listening is mostly south of 80db.
One intriguing possibility would be speakers with powered bass unit (eg Zu Def 4); the limitation of the 30A is mainly in the lows, if one doesn't listen too loudly.
I think you'll get more helpful advice if you narrow your price range.
John