if you're wondering whether or not a powerbook g4 will be fine, i can tell you it will. as for the apps you asked, i use cs3, aperture, and final cut pro, amongst others like office (not pages) and regular stuff (entourage, firefox, etc.) on a powerbook g4 1.33ghz and it runs great. it's not fast but it works - if that's what you're wondering. it might get frustrating at times when you must wait for things to load but it won't crash. i've since upgraded to a mac pro because of my impatience and for efficiency purposes but my powerbook remains the machine i carry around wherever i go (where portability is crucial).
i've been using my powerbook g4 for so long now and it's never disappointed me. i can't get myself to dispose the machine. everything still works and is likely to continue working for some time. it looks decent too. i have the 17 inch model and the display is still great. i've since maxed the ram and the hdd space too.
however, if i was in your position, i'd get intel. i was just assuming your question was whether a g4 will be fine. it will.