I'm curious as to what kind of contract makes sense for Carolina that Williams will actually take. He won't come cheap and that is the difference between my opinion and the opinion of those who think he will stay. I don't see Carolina giving him a huge contract in a salary cap world, especially in a salary cap world.
Where are all of these examples of RB's that get massive contracts in free agency from other teams?

I don't think Williams is going to get big money on par with quarterbacks, defensive ends, or even WR's. Teams simply don't break the bank for RB's. It won't be hard for Carolina to re-sign Williams.
Put some numbers to your answer so I can get an idea of what you (and others) consider to be a reasonable contract that Williams would sign and Carolina would pay.
I already did - 20-25 mil guaranteed, lets say 5 years 35 mil. I think that's the high end of what he can get. last year, MJD got a 5 year, 31 mil extension, with 17.5 guaranteed. In 08, Turner got 15 mil guaranteed in a 6 year, 34.5 million dollar deal. SJax got 20.5 mil guaranteed in a 6 year, 44 mil deal. Gore signed a 4 year, 28 mil extension in 07, but only 6.5 was guaranteed, along with a 4.2 mil option bonus in the next year. McGahee got 26 mil over 5 years and 7.5 mil guaranteed, and lots of bonuses in the first few years.Elite RBs aren't expensive compared to other positions, Cassius nailed it. Think about it. M-freakin-JD only got 6.5 mil more in guaranteed money last year than Burleson got this year, and he's got his whole prime ahead of him and a short injury history compared to Burleson.I'll also reiterate two more important points in favor of DeAngelo being re-signed - 1) Jake Delhomme's money is totally off the books now b/c of the uncapped year. 2) No first-round signing bonus this year because they traded the pick for Everette Brown. No first-round signing bonus last year because they traded the pick for Jeff Otah. They have money to spend.