Is the 2B RAM on the base 13.3" MBA enough for most users? This will be our first Mac computer and my wife will be the one using it mostly everyday. She will be mostly using it for web browsing, MS Office for Mac applications, Facetime, iTunes and Skype. We don't anticipate doing any video editing or Photoshop on it. Also we plan to keep the computer for atleast a few years. Will the MBA with its Core 2 Duo chip and 2 GB RAM risk becoming obsolete within the next year or so with Sandybridge and Lion around the corner? Will it slow down to a crawl or something if we install Lion on it when it becomes available? How much of a future proofing does the current base model 13" MBA offer, if any?