how thick must a liner be for a nice pond?

i have a molded pond now for the last 13 yrs, but it cracked this summer so it's time for a change. We would like to do it ourselves, as my husband would like to cut corners, i must get out there and price a few things from a larger pump and a large liner so it will last another 13yrs. Alot of the rocks we have, just may need a few LARGER ones, but also a few lights would be nice too. so my question is thickness of liner and any hints where to go to start. i. would like to go bigger and better. Ebay i know but any other help you can give me. ty cindy in rochester n.y.
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