Hi all, im considering buying my moms old 2.2ghz white macbook so se can get the new air. Its got the original 5400rpm hd, and I upgraded it to 2gb of ram for her a year or so ago. My question is, if I get it, what would be the better upgrade: An SSD drive for ~$120, or 4gb of ram + a 7200rpm drive for ~$100? Im thinking probably the SSD but want to hear from others. Also, will the SSD give better battery life? Will the 7200rpm hurt battery life? And how would a macbook perform with the ssd, does it have that "instant on" feeling that the new airs supposedly have? Thanks!