I personally have had great experience with Crucial ram as well as OCZ. 2gb would be best (that's what I use cuz I'm spoiled:D) but I'm certain 1gb will suffice. Many worry about different speeds i.e. PC2700, PC3200, etc. A PC3200 will just underclock itself and run at PC2700 specs. Just a word of caution: don't buy those fancy schmancy ram modules that require a higher than normal voltage, I doubt a Dell mobo will be able to supply it (I learned that the hard way).