yes, any 2.5in and SATA drive should work for you. I would NOT recommend 7200rpm since it will use more power from battery, and generates more heat. Also noticed higher failure rate. Just get a 5400rpm drive.
I hope you made the recovery discs right after you bought the computer. Without it,you either have to buy from Dell or do clean install (Windows version and CD key on the bottom of computer) and install all the drivers.