The twin 6 be is actually not a three way monitor but an MTM design, which means both woofers are basically doing the same thing. They are very nice, but could use a sub for the lowest octave. Opals sound good too, if a little boomy by comparison, but it does exhibit some hiss from the amplifier. Drivers over 6.5-7" tend to have trouble in the upper midrange in exchange for a lower reach.
I have never heard a good Coaxial speaker so I would be hesitant to trust the Presonus. Especially with the addition of a digital DSP and cass D amplification. Never much liked Dynaudio, just a pile of mud in the bass, and Genelecs sound nasal to me.
The best smaller active speakers I have heard are PMC AML2. The transmission line design means the bass will not drop off at lower volumes.
I personally use a custom passive system with SEAS drivers. The sound is just spectacular, and it yields great results in the studio.