The B&W 685 S2's that I linked are $600 shipped and look to be in pristine condition. The OP wants to stay closer to $500 ish. As such, if he decides on the 685 S2's, then the link I provided offers a very viable option. Moreover, I also provided a link for the matching center just in case the OP was thinking about going in that direction. I do, however, wish the OP the very best in rendering HIS decision!
Phil