Tom,
Independent 4X has a full stainless steel brake line kit for us:
http://www.independent4x.com/Isuzu-B...-Set_p_21.html
I bought this kit a few years ago, put it on and haven't had a problem since.
I would cautions you, though, not to do what I did and leave the system open for a few days.
I took everything off, and apart, and painted the calipers. The system sat open for a couple of days while I got the calipers painted and dried and when I put it all back together the brakes never felt quite right. Come to find out my master cylinder decided to give up the ghost and I had to replace it. Now, I don't know if it was going out anyway, or if leaving the system open that long dried some stuff out and ruined it.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless