I am looking for the cheapest Macbook or iBook that could reasonably run iWork '08. Specifically I will be showing graphic intensive Keynote presentations. I know the specs recommend 1 GB Ram, 32 MB of video memory, and 500 MHZ processor, but I want to hear from real world users. I don't want the presentations to hang up or be sluggish. What kind of notebooks are you using to run iWork '08? Macbook or iBook? What is your experience with this?