I have a 128mb RAM PC laptop right now. Its really slow, and I like to be running three applications at once. I can't do that now. This is the most I want to be running at the same time on my new Macbook (when I get it) 1) iTunes 2) Photobooth 3) Safari with Facebook open (on Facebook it will just be general things like scrolling down the newsfeed hahah), Picnik.com open to edit photos. 4) iWork will the general 2gb ram be enough for this or should i pay extra for 4gb??