Tommy Lee Jones wants an extra $10 million for his work in No Country for Old Men. Not knowing anything about his contract etc I'd suggest giving Tommy his money. No one else could have played Tom Bell.
On a side note, the AV Club has nice Coen Brothers primer. I agree with the entire essentials list (page 4) beside Barton Fink. I'd replace that with Oh Brother.
Oh yeah, the AV Club also has mini-review of the new Coen Brothers movie, Burn Before Reading. You'll have to scroll down a bit to read the review and see it got a B+.