Yes, you can use the Denon speakers as surrounds, although the QSs are really superior in that function. In your small room it's difficult to get enough dispersion from the surrounds since they're so close. One technique is to not have them pointed at you, but instead turned toward the side or back walls.

Not being familiar with what receivers are available to you there, I'd suggest in general one of the Denon or Onkyo models with Audyssey calibration/room correction.

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

Enjoy the music, not the equipment.