I have a 15" iMac (800MHz, SuperDrive, 512MB RAM), and I'm thinking about selling it to get a PowerBook. Right now, the only one I'd be able to afford would be the 12" Combo Drive. So these are what I need compared: 1) CPU Speed - Is 67MHz that much of a difference (or any at all)? 2) RAM Speed - The PowerBook uses DDR RAM, will that make a big difference? 3) Display Size - I know that both the 12" PowerBook and my 15" iMac have a max resolution of 1024x768. Would a smaller size screen with the same resolution hinder anything? (I also know that the PowerBook is capable of extended desktop/desktop spanning) 4) Video Card - My 15" iMac has a GeForce2 MX. The PowerBook has a GeForce4 420 Go. Which is better? 5) Optical Drive - So far I've burned 0 DVDs with my SuperDrive, so I guess I really don't need it. Also, I've read that a SuperDrive is slower at reading/writing/rewriting to CD(R/RW)s than a regular Combo Drive. Is this true? 6) Upgradability - I know that if I need a bigger hard drive (which I highly doubt, as I only use 10GB of my 60GB one), that the PowerBook would be a whole lot easier to upgrade than my iMac. But the PowerBook can only have 640MB of RAM, as opposed to my iMac's 1GB limit. I think I had more questions, although I can't remember. Hopefully Apple will update the darn PowerBooks, and then there will be no point to this topic. Also, please note that I use Photoshop and other RAM-eating programs.