Hi, I'm looking to get a MacBook Pro for photo editing, but I don't have a clear understanding of what the specs mean and how that stuff relates to my purposes on the computer. Basically I want something with a good screen for photo viewing, enough memory to hold thousands of photos and songs, decent speed to watch movies online. I don't think I need anything super high tech at the moment. It would really help me out if you could take a look at the (probably crappy) specs of my current old Powerbook and tell me very simply what is bad and what aspects to look for when buying a new or used replacement. Thanks so much. 
Machine Name: PowerBook G4 12"
Machine Model: PowerBook6,8
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.5 GHz
L2 Cache (per CPU): 512 KB
Memory: 768 MB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.0f0
Sudden Motion Sensor:
State: Enabled
Version: 1.0

Machine Name: PowerBook G4 12"
Machine Model: PowerBook6,8
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.5 GHz
L2 Cache (per CPU): 512 KB
Memory: 768 MB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.0f0
Sudden Motion Sensor:
State: Enabled
Version: 1.0