What is the difference between Dell's Inspiron 1525 (T2330) and Inspiron 1420 (T5550)?

The Inspiron 1420 is a newer since it carries a Intel Core 2 Duo T5550 processor. Its faster running at 1.83GHz with a FSB of 667MHz. Since you will be using it for watching movies, playing music, burning dvds, using statistics programs, adobe CS2 I would say that you should go with the cheaper model.