I have an iMac G3 700 MHz with a 60 GB HD and 700 some MB of RAM. I also have a 400 MHz PowerMac G4 with 300 something MB of RAM and a 20 gig HD. I need to bring one to my dad's house, and need the most powerful one there. Which is the more powerful assuming I can upgrade the HD and RAM on the powermac? THanks..