I have been looking into buying a Mac lately and for my needs a MBA seems to be perfect. However, I want this laptop to last a very long time (4 years+) and I am concerned the 4 GB of RAM will be obsolete soon so I feel 8 GB would be better. The total cost after a student discount and tax comes out to $1300+ which is a lot since I usually never spend more than $600. With that said I only want to make this purchase if people can verify the lifespan of these items. Like at what point will I start to notice a slow down in the performance (I do take pretty good care of my electronics)? For a $1300 laptop I would like for it to be solid for a decent amount of time rather than start to get bogged down after only 1.5-2 years.