Can anyone tell me the exact length of TOTAL wire i will need to do my whole car in 0gauge wire?? Help!?

I have an 02' mazda 626 Lx 4door 4cyl automatic.. Want to do everything.. (The big 3, battery to amp, and also (if it will help) speaker to terminal (10gauge) n terminal to amp (10gauge).. Also what brand is good and can i get away with abrand called "Watt you want" for $4 a foot? Also have free wire at my job (0gauge) welding wire rated at 600volts! Lok mite be overkill but figure it culdnt hurt, no? PLEASE HELP.. THANX!