At this point, I could see them bringing them both back provided Nate's not getting a contract increase. TA's contract will be a relative bargain and he's played well this year to earn it.
If both are resigned, and I'm assuming Ray is also, C's have their 9 man rotation in place for another season which will give them another year to gel with Sheed and Nate. Free up Finley, Scal and Shelden's spots for an MLE 4/5 swing player (Travis Outlaw would be my choice) that can immediately contribute and a 5th big that's not a stiff (good luck with that). spots 12-15 can be used for developing young players that won't be required to produce immediately but can learn and contribute next year or, if we're lucky and they do so, contribute this year.