I have been looking at a new mac book to replace my macbook 2ghz core duo. I saw today that they have the 1.6mhz 2gb of ram, 80gb air for 999.00. It is a refurb, which does not really bother me. Besides the obvious size differences what might I expect in the following areas: I have heard the 1.6mhz is kinda slow. It will be used just for general use word, quickbooks, multiple monitors, email and web. Will the 2.4GHz new macbook show me a noticeable difference. Will a ram increase on the air make a difference, and is it easy to do on the air? Trackpad, does the air use all the same multi-touch gestures as the mac book. How well does the drive sharing software work for basics? Case build, I know the macbook is rock solid in structure how about the air? Monitor port, is there really a difference? The size of the devices is not really that important, however I can save about $600.00 over the macbook I planned to get. Any help would be greatly appreciated.