I agree with the above post, in that size room I would go with a 2.0 setup with two towers. They will rock the room and you wont miss a center or surrounds. This will also allow you to get a higher quality LR rather than trying to build a full 5.1 with a $500 budget after the receiver. If you get them and decide the bass is a boomy due to the room, a couple of corner bass traps will help.
The Infinity P363 is a great recommendation, especially since it is front ported, most likely you will be placing them against the wall.
Last edited by advanced101101; 08-04-2014 at 05:47 AM.