"I'm gonna be tempted to get a new MacBook to replace the iBook"
I have two now and love 'em. I would do one thing first. I would get to an Apple Store with a list of my favorite websites - especially those with media - and test them all completely.
My only frustration with Intel Macs is that there are a few websites that are broken. I had to go back to the boneyard to get a conference call to play today.
LOL - you got one of those, too? Hard to part with old macs.... they still work, just not as zippy.
BTW, does Firefox work any better that Safari on those sites?