OK - I've got the itch for a new mac. Currently I'm using an iBook 500MHZ with upgraded HD and 600+ MB of memory. I use my book for small iMovie projects and plenty of Ripping and Burning. I know some of you have both (Peter) and want to know if I'll see a significant difference between my current ride and a 1 GHZ 15" Powerbook? Is there a noticable difference between the current 800 MHZ iBooks and the 1 GHZ 15"? I know I'd like the additional screen real estate - just not sure it and the super drive are worth another $1000. Dan