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I used the newer NICOPP tubing (nickel+Copper+Iron) on one of my projects. Really easy to bend and it will not rust. I bought mine from this guy:
http://www.ebay.com/itm/CNC625-3-8-C...3D141563486115
Best price I could find at the time. It bends really easy and flares easy with a regular double flaring tool. There are coated flare nuts available for it too. Some of the auto parts stores carry it but it is more $. I don't know how it would do with the AN6 tool.
LockDoc