...you want to buy any 2.5-inch...PATA or IDE laptop hard drive.
Size is up to you...just try to get the most for the least
. Brand names are inconsequential, there are only so many hard drive manufacturers and I cannot really say that any one is better/worse than the others.
Have you bothered to take a look at your current hard drive? That will give you a physical image of exactly what you are going to buy, only the capacity will be greater. If you haven't opened that bay in your laptop to take a look, you probably should do so and you will see what the connections and connectors look like.