[slow&rusty]

I design water main for a living and you have some choices based on pressure in your neighborhood. You say water main but I belive you meant to say "service" to you house broke?
Without getting technical here are your choices:

1) High Density Poly Ethylene is the best, most common, flexible and best in terms of price. In the industry its known as HDPE

2) PVC

3) Copper is used still widely for services.

I would recommend the HDPE all day long, the industry is going this way.

Hope that helps - Yasin