XPS or Inspiron

Let's see,the 1520 only comes with T7500 2.2ghz processor.Major delays on the colored led lids.160gb 7200rpm no 200gb at that speed.Screen res.is 1680 x 1050.                                               XPS 1530-T7700 & T7800 Processors offered-Screen res.-1280 x 800-200gb 7200rpm drive or 250gb 5400rpm.Slot loaded blue ray drive - the 1520 is not slot loaded.Thats basically the only differences.Merry christmas