If you are looking for a rich but natural sound with plenty of bass and detail for believable sound, the Trenner and Friedl ART monitors get my vote. I would recommend the second version used to save money, or the third (current) version new or used. I’ve heard the second and third versions, and as at least one review states, there isn’t a huge difference between the two. Your gear should do the job nicely. The ART monitors excel in smaller rooms like yours, especially with good stands.
I’ve heard the Oscar Duo as well, but I’ve never heard a rich or full enough sound out of them. Light but detailed would describe what I’ve heard.
Have fun with the hunt!