So I took the plunge and did the mod. It actually didnt take as long as I thought it would. I was also replacing the hard drive so it was already apart. I decided to go with 600/100 and wow! You can see the results immediately! Very happy and highly recommend this mod!

Best advice I can give to anyone attempting this. Take your time! The best frame of reference I can think of for the size of the resistors you are working with is the size of a pin head, and you must solder very close to other solder points, so your margin of error is very tiny to say the least. Good eyes and a steady hand are a must!
PowerBook G4 Ti 15" 867 MHz DVI
1GB RAM - 120GB HDD - 10.5.4