I am coming from windows, where I have 4gb of ram, and even when I am only using google chrome (sometimes I have like 12 tabs open though) and itunes, my Ram usage is usually 60% or higher. I have heard that osx is more efficient with using RAM, so even though I currently always use more than 2gb, do you think it would be enough to smoothly run a few light programs, say ms office, itunes, and chrome, at once? I don't think I've ever maxed out my ram, as I usually use like 2-3gb on my current machine, so I'm not really sure what happens when there's not enough RAM. I'm guessing it just gets a whole lot slower. Also, is there a reasonable chance of 4gb ram coming standard with the new MBAs? I think that would be the only thing I want more than a backlit keyboard for the refresh Normally, I wouldn't worry about the $100 upgrade for 4gb (even though it is a bit overpriced), however it's the tax that makes it so much more expensive. Since Amazon doesn't sell MBAs with 4gb ram, I'd have to custom order it from Apple, and it would look something like this: $1300 base price $100 for ram upgrade 8.25% sales tax Total: $1515 Through Amazon, it's $1260 for the 2gb with free shipping and no tax. So I'd basically have to spend over $250 just for 2gb more RAM. Is it worth it? Btw, I'm talking about the 128gb 13" Oh and this will be my only computer. So it's not like I can just hop over to my Mac pro if I ever need to do something more ram-intensive.