Room treatments can only get you so far. In my experience, DSP-based room correction was needed to bring audio bliss to my systems. My hunch is that pending money on DSP is likely going to by more cost effective than room treatments as a primary solution.
"The room can totally wreck, or make, a system"
For those interested in dealing with the most important part of their system -- indeed, the precondition for a good system: the room.