For those of you with the new new macbook airs with the 2gb of ram installed, do you ever feel like you should have gotten the 4gb option? Do you ever get slowdowns as a result of too little ram space? Thing is amazon does not have the 4gb option for sale. I would have to resort to getting it from apple.com and it would bring the price from $970(amazon.com) to $1,200(apple.com after tax). I dont know if 2gb of ram is worth that. Thanks in advance.