However, a dedicated 2CH system does not have the luxury of instanly switching to MC.
You have that luxury alot of us do not have. Since you have great fronts, I'll say you are well covered. You truly enjoy your MC setup for movies, and sounds like you dont enjoy MC music as much. If you can get 3 or more speakers that are as competant as your fronts, then you are done.
I kinda have the idea that you are not a vinyl guy. Do you think you are willing to experiment with that? You may want to invest a little into vinyl rigs and see what you think with your T6s. If you dont like it, then you can alway get 80-90% of your initial investment back on Agon. Sometimes you can make money off of it.
Rega is introducing P1 for $350ish.
Whatchu think?