I have seen the thread about 1.83 ghz vs 2.0 ghz. I am inclined to buy the small version and add more ram to it. But have anyone tried both next to each other for more than just tippy typing and browsing the web? There are obvious advantages to more megahurtz when you do heavy duty stuff like encoding, rendering and working with stuff like Photoshop. I am not doing a lot of that however. I just wonder if there is a perceptible day to day difference in performance once a macbook has more than 512 MB?