I have a fairly new 20" iMac G5 (previous to iSight) and was thinking about replacing it with a 15" PB. I don't do any real work on the iMac to need the extra power. I do WoW, internet, mail, listen to music, some iPhoto...general work. I recently bought a PB which I still have, and I'm within my 30-day return period to Amazon. I have those annoying horizontal lines on the PB, but they are barely visible under normal work, only when editing pictures or video they are slightly noticeable, but kind of bothers me to know they are there. Is this a smart choice? Or should I return the PB and get a 12" iBook or 12" PB and keep my iMac? I do most of my work at home now, but I'm starting college soon and think I might need the portability, thus I'm considering a portable. Any thoughts on this? Thanks.