So I just pulled the trigger and bought a single pair of QS8 surround sound speakers. While I wait for them to arrive, I would like to get your thoughts on where I should place them.

My home theater is located in a room 16'2" wide and 19'8" long. The ceiling is vaulted and roughly 11' high.

Below are some pictures of my room. My usual seating area is on the right besides the window.
http://img29.imageshack.us/gal.php?g=dscn1191e.jpg
http://img528.imageshack.us/g/dscn0826.jpg/ (these were taken before moving into the house)