Rust on bottom of doors, celicagurl possibly enlisting in your help Options

[kash1355]

So for the past few months I've been trying to get paint job quotes and usually the number one thing that comes up is the rust at the bottom of both my doors. I've been getting quotes from $2000 -$4000 (canadian) to get the job done (colour change from silver to black) and fix the rust, but every shop was saying they would treat it differently. Here were the options:

1. Weld another piece of sheet metal to the bottom half because the lip is soo badly rusted
2. Sandblast all the rust and the fill it with bondo (???)
3. Sandblast the rust, dip it in some kind of acid (i guess to prevent the rust from coming back) and then fiberglass the holes.
4. lol, obviously get new doors (but it's really hard to track them down in canada)

Which is the best option (most proper) to go with... (and on a side note is the $2000 - $4000 a fair price range?)

Here are some pics of the rust...(sorry about the size but i wanted you to really see the rust good )