I currently own a Sony 715P DVD-player. I got it at The Wiz when they were closing down about 6 months ago or so. I paid about $150 for it. What is the difference between this and the $400-500 players that I see on the market. Do they do something different or better than a cheaper one? Mine comes with progessive scan, DTS and DD decoding as well so I don't understand what the advantage would be if I paid an extra $300 for a player.