Kingston or Samsung is what you should stick with Al. Crucial and Corsair are good, but they are more expensive and designed for performance applications.
Kingston and Samsung both have a lifetime warranty, and both are recommended by this geek
Al - hit me up on AIM and I'll help you pick out what you need....looks like it's DDR 2100. Buying anything faster than that (2700, 3200, etc) will do you no good unless you are overclocking the machine.
- Justin