Hello, I am looking at buying either and Air 13" (8GB RAM, i5, 128GB) or Retina 13" (Base) for taking to University this September and I am looking to buy now. I will be studying Medicine so nothing graphics heavy or too demanding mainly word, internet, itunes etc I have gone into the store to have a look and play with them both. The retina is within my budget so not being limited by price the retina seems more powerful on paper and in terms of future proofing a better deal. However, what concerns me is the never ending saga with lag that the 13" seems to experience. Even in the store today resizing windows was slow and very laggy. So my question is how do people find their 13" Retina's now after all the updates etc IS LAG STILL A PROBLEM? Generally also would an Air be able to last 3/4+ years without starting to really slow down. Which should I go for given my needs?