Check out these guys:

http://www.intechusa.com/

They make software tools to get around the 128gb limit, Though I have never personally used it. I believe people have had mixed results with their products so do some research before you commit. But it at least opens the possibility of a larger drive.
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PB G4 15" 1.2ghz - Pismo G3 400 mhz - iBook G3 500 "Jukebox"
"SawSmurf" G4 500 - Quicksilver G4 Dual 1ghz modding...