Hi, I am so excited with the new Macbook Air's, and was intending on buying a new one. A friend is also offering to sell his old 11" 1.6ghz/4gb/128gb Model for $800. Is that a decent buy? Will I be missing much in features like the new processors? I've been happy with my computers (Core 2 Duo) but any extra speed can't hurt! Please let me know what you think, Thanks!