Gas Tank Advice Needed

[farside847]

Well, Im told the source of my problems is a rusting gas tank. My tank is in the cab, and it is going to stay there. So, now I have 3 options:
1 - Have the tank dipped and sealed by the radiator guys
2 - Buy a new tank for $200
3 - Buy a good used tank for less.

What would you do?

History: I had this same tank dipped and sealed 10 years ago, it worked fine for 10 years, but I wonder if the problem will just come back? I could get a used one but Im a little affraid that it would develop rust too. So, that leaves a new one - anyone used one of the repop galv tanks that all the suppliers sell?

Thanks!