Anyone got an opinion on the real life differences between a 1.2ghz, 1.33ghz and 1.42 ghz 14" iBook? Are the sudden motion sensor, bluetooth stuff, plus speed bump worth the money on the new machines? How much faster is a 1.42 than a 1.33 or 1.2? I have no idea and am thinking about getting another machine, cause I like my new 1.33 14" so much. And is the superdrive in the new iBook worth it?