Thanks all of you for your good advice,
Finally, I got a 800/30GB/640MB for $1,200 at the UW-Madison computer store. Overall a very good deal. This computer is mostly going to be used by our laboratory personnel for presentations, writing, etc.
I am a tiPB owner (rev A 400/40 GB/384MB). I just wanted to tell you iBook owners, that I was shocked of how well built this machine is. Impressive package, very well presented it felt as special as when I bought my tiPB two years ago.
I perform a clean install, updates, and loaded Office, photoshop 7, Illustrator 10, Keynote. Pretty fast overall. I must say that I love the screen and keyboard feeling.
Huge deal, and a very good quality/cost ratio. Now, I understand how you praise your machines.
Have fun with them! (I know I would)