Thiel 3.6 to Eggleston Andras II

If you like everything about the 3.6 but want more dynamics I'd seriously think about adding a sub, but not just any I'd look at a REL. You be really shocked at what one can do for deep bass, and dynamics and they really open up the sound stage too. New B series are killer.

PS: I also owned 3.6's at one time..

Depends on the size of the room and the sub.. I think a single REL B1 would certainly do the trick.. A pair of B2's would also be sweet.