JZ,
Sounds like we have taken a somewhat similar audio path. I used Trios, driven by a number of wonderful single ended triode amps (the Tron was by far the best of the dozen plus I owned), and I bi-amped them with fabulous custom-made woofers and equalized the bass. The horns were run full-range and the woofers run through a high quality lo-pass filter.
Then, I ended up purchasing a pair of the MBL 111Bs and quickly moved up to the MBL 101Es. My room is large enough to accomodate them (21 x 31 x 10)and they do many things I have never heard from any other speaker. I am currently driving them with either the BAT 600SE which works very well, or a pair of mono MBL 9007 amps. Either is up to the task.
The break-through for me was a purchase of 9 RealTraps room treatment panels. They look very nice and do they ever make a sonic difference. They eliminate all peakiness and really work wonders for the awesome MBL bass, which can overwhelm a room. You should check them out - I consider them a must for MBLs.
Also, the BAT REX line stage and Kubala Sosna bi-wire speaker cables have a wonderful tonal balance for the MBLs. Get the cables and room treament right and the musicality of the Trio/single ended triode amps will be there for you.
Good listening!
David