Haha Jon said all I wanted to to be honest. My MacBook Pro powers my external 20" monitor, so I've got dual screens now, and it's absolutely awesome. It does depend on whether you want portability I guess, I've got a Laptop for Uni just so that if I want to, I can take it to lectures or the library or whatever really, not be confinded to my room. Photoshop runs really well on Os X anyway, and like Jon said it's not graphics card intensive so you should be fine. Upgrading the ram would see a Mac go a little quicker, and it's not that expensive if you know where to look, or order it with your computer from Apple so you get discount from them keeping your old ram. Plus you already have CS3 for mac