It seems that next to RAM, the most important thing for a music machine is disk speed and 4200 is ridiculouisly slow, isn't it? I mean, for let's say a 7 minute song with y'know, 10 tracks or whatever, and a few softsynths, will an iBook with 512 end up queuing audio onto the hard drive and slow to the point of uselessness?
It's too bad the iBook doesn't come with a 5400 hard drive option; I'm left with a jump from a $1000 laptop to a $1600 one, and it's depressing because I really wanted to get a mac too. But the iBook has everything I need except that. Maybe I'm wrong, is the HD really that important after all?