To me, for al bench players, it's always about money. The biggest salaries go to the starters who 1) get the most minutes, and 2) are better players. That only leaves so much to work with, so the bench becomes a matter of who'll play for what.
We can give Tony whatever we agree to because he's our guy (bird rights). The guys on 1 year deals can get a max of 20% over their current deal per year (I believe) without touching the MLE. That amounts to:
Nate: 4.8 mil/yr
Quisy: 2.4
Shelden: about 1.5 I think?
I wouldn't give any bench guy more than a 2 year deal. Some might want more and get it elsewhere, but with the CBA as it is, I doubt it, unless some team thinks Nate or Quisy will be a starter or get major minutes, which is possible, but not likely (exception: see J.Crawford, 6th man in Atlanta).
I'd gladly keep nate for 2 yrs, 3 mil each, perhaps with incentives.
I'd keep Shelden for the minimum, or 20% raise, for 2 years, if no more athletic PF is available (Warrick, even James Singleton). He knows the rotations. That's worth something.
Quisy: Best of luck, dude. I wouldn't bring him back.
TA: I'd keep on a similar deal to Nate's.
Finley: He wanted another ride, and this is it. His spot needs to go to someone who can either play some minutes or at least has upside for the future. Ditto for Scal.
Our bench would be reasonable at the 3 mil/year level for Nate, TA, and BBD.
Sheed is on a MLE deal, and we have the MLE to spend this year as well. An athletic scoring/defending forward (PF, SF, or a bit of both a la Al Harrington) would fill out the top-10 roster rather well, with Shelden plus draft picks filling out spots 11-13/15 without totally breaking the bank.