I have a MacBook (SR) 2.2GHZ with 1Gb of memory. I took a peek at the activity monitor and saw that my ram was being used extensively and almost always using the max with 10-20MB free. I was thinking of upgrading my ram, but I can't decide on which brand, crucial - micron - or samsung. The last two are from macsales.com which claims they are factory originals. So which brand? Any advice? Crucial is $50 for my system, while the other two from macsales.com is approx. $60. Any help would be appreciated. Thanks!