i wouldn't buy a G3. cuz i wouldn't want a stupid motherboard failure.
also consider the cost of new battery ($150 i think), upgrading ram to 512mb to run tiger or panther comfortably (~$30-50?), fixing cdrom ($100 - got that from previous post) :|
all that amounts to $280?
+ 400 to buy the machine itself. = total 680.
u can also consider $800 G4 :|