Hi, I have recently purchased my first AV receiver, Denon 3802. I found a great deal on it locally. I now need to find some appropriate speakers. The receiver will be used in our den, which is 20 feet long by 12 feet wide. This room has 3 walls with a half wall on one of the 20 foot sides, which opens up to the dining room and kitchen. The tv, receiver, and etc will be located at one end of the room, in an armoire. Because of the layout of the room, I really would like to purchase speaker that can be mounted to the wall or ceiling. At least the rear speakers must be mounted on the wall or ceiling. I do not want to spend thousands of dollars on speakers, but I would like something that is appropriate for the room and use with the Denon 3802. We will use this setup 99% for movies. What would you recommend?