This may not be fair because I'm selling a pair of R3's now, but here are some brief viewpoints on monitors that I've owned:
Tyler Reference Monitors: Since they can often be acquired on audiogon for around $1100, they represent the best buy for the buck.
ProAc Tab Sigs and Response 1 SC: Fine monitors, but they are really dependent on the front end. I'm not sure if they would mate well with Plinius - in general, they sound better with tubes.
Merlin TSM-SE: Very neutral sounding, clean and fast. Since the VSM-SE's don't really use up any more space when you take into account the stands, they are much better than the TSM's.
Dynaudio 1.3: More solid-state friendly, but as NW stated above, they come across being somewhat dry and analytical.
Red Rose R3: By far my favorite. They are by no means neutral. They are wet, seductive, and romantic, and they do justice to a concert grand Steinway in tonality and size. At the same time the ribbon tweeters render things like cymbals, bells, and other ultra fast transients with stunning vividness. Because of their small drivers, they will not load up a small room with dominating bass, yet the bass is very correct and satisfying.
Good Luck :-]