Okay, so my mid-2009 MacBook Pro was a great machine, but I'm thinking of upgrading. Honestly, if I get a new laptop every 3 or so years, will the MBA work just fine? I'm a student. I like multi-tab browsing, Office Suite applications, iTunes open amongst a few other things at the same time, but I really don't like lag/slow response. Thus, upgrading from the 09. I'd prefer to keep it cheap, but I'm looking at the future, what are your guy's thoughts? Is the retina just ridiculously out there for what I need? Or in a year or two will the MBA at approx $700 less make me upset? Just looking for any input. Thanks guys!