My dad just got a new G4 PowerBook, and gave me his Pismo. He was running 9.2.2, and I put a Panther install on it. Now, I'm wanting to put a CPU upgrade in it, and the options boil down to either 550MHz G4 or 900MHz G3. Which one do you think I should do? I'm needing a 2nd/3rd/4th/? opinion. All I'm really using it for is for when I need a portable, giving keynotes, etc. Nothing professionally creative. Maybe a game (Age of Empires II -- had it forever) It's only needing to last about 2.5 more years.