I would recommend a good 6.1 or 7.1 receiver over a 5.1 receiver. DVDs that have a DD EX or DTS ES Matrix or DTS ES ES 6.1 soundtrack have better imaging with the rear center 6th channel in my setup. I actually have a 7.1 setup with my Sony DA4ES receiver and it sounds much better then my previous 5.1 setup in my room.