Perry's done. There are too many people ready to vote against him in the primary because of this one issue.
...and here is another excellent article from the Austin American Statesman http://www.statesman.com/search/content/metro/12/12corridor.html (you may need to register).
This one gives the total cost at $183B, which is totally wrong - but what the heck, according to the article, all of the "experts" have discounted the plan as a pipe dream.
Well, it's not a pipe dream in Austin and other places, as toll booths are starting to materialize out of thin air.
Note that the article also makes it clear that this plan is a total white elephant. It doesn't stand a chance of getting private funding for a long, long, time.