If we're going full rebuild, as Bo says, a guy like Ed Davis (or Demarre Carroll) makes sense.
I'd see what first rounder the Miami Heat would give for Ryan Anderson. (Taking on Allan Crabbe's contract fetched two first rounders, of course with Taurean Prince headed the other way as well).
I'd try to see if Charlotte would give us Marvin Williams (expiring) for basically free, since they're going to have major cap/tax problems if they re-sign Kemba and Marvin fits well next to DeAndre. Or maybe Marvin & MKG & the 12th pick this year for Iso Zo and Dotson and their own second rounder back.
I'd take Evan Turner or Meyers Leonard from Portland without sending anything more than a 2nd rounder back, if they want out of the tax.
Those are players that can still actually contribute. Another option is to just seek dead cap weight in exchange for first rounders.
Biyombo is a large expiring, but you definitely need to take a 1st to take him on. Same thing with Mozgov over in Orlando.
The Wizards will have issues if they don't kick start the rebuild - how desperate are they to rid themselves of Ian Mahinmi?
From OKC - would they give their first rounder for us to take Andre Roberson and Patrick Patterson?
Memphis probably won't give up anything interesting for Chandler Parsons.
There is an irony in having dumped Courtney Lee just to go back into the market and take on contracts just like his. Irrespective of whether Durant signs, if we don't get an all-star talent for next season, I want to be the Hawks for a year. Trust that some of the youth, including RJ, will take major steps forward. There's lots to like.