Dustin, of the items that you list, in my view the QS8s would be what would increase your listening enjoyment the most. The M80s can do an excellent "phantom" center if necessary and the 3311 should be plenty for your remaining power requirements. The QS8 side surrounds can make things more realistic and impressive for all 2-channel(with e.g., DPLII)and 5-channel source materials.

-----------------------------------

Enjoy the music, not the equipment.