hi, i'm a graphic desginer and currently thinking out loud about buying a mac (portable), i'm not sure however which one is best suited for me. i'm using flash mx 2004, photoshop and some 3d packages, is the iBook enough for me? or should I go with the more expensive power books? is a 12" screen big enough? - doesn't seem so , i've been told that it's pretty small and that I should get at least a 14". any help?