Unfortunately, it's getting harder and harder to find PowerBook G3s for sale - especially working examples. If you can find one however, I'd recommend the Pismo which features two FireWire ports and either 400 or 500 MHz processors.
3x Apple Mac Powerbook G3 rare Black spares repair
Time Remaining: 2d 10h 27m
Buy It Now for only: £90.00
Time Remaining: 23d 20h 10m
Buy It Now for only: £380.00