The drainpipe in our sink broke (corroded right through in several places). Not having the time to find my pipe wrench (much less actually replace the pipe) we called a plumber. The plumber replaced the drainpipe with PVC (under the theory it would be immune from corrosion).
So I got to wondering: Is there any reason to prefer one kind of drainpipe to another? I know that for blackwater lines you need to make sure the urine won't corrode the pipe, but for a kitchen sink does it matter at all? I could even use lead pipes since that water will be treated before anyone drinks it, right?