RogueLodyte · M
I replaced mine with all copper 40 years ago, including a one inch main line into the house. I did all the digging, routing, soldering, laundry hook up, hot water tank, and fixture work myself.
BrewCityBarfly · M
PEX seems to be the de-facto standard. I have old galvanized pipes, and replacement is on the list, but there are a lot of things on the list ahead of that.