Setting up new HDTV

Question

I have a new Panasonic HP th-50pf9uk monitor, new wall mount, 4 Dalquist DQ 10's I would like to use. Rengar has a center speaker they say designed to compliment DQ 10's setting home theater and Subwoofer its expensive $1150 shipped. My Question, what will need to use my speakers.   Cox Cable HD box and have not bought DVD player yet.  Considering X-box 360 to play DVD's until I can research more.