Of the deals in this thread so far, the threeway deal with Memphis where the Cs get Gortat, the Suns Gay and Melo, and the Griz Terry, Dudley and Collins makes the most sense.
Dudley is cost controlled the next three season at around $4m per. Terry is relatively affordable the next two years at $5m per, and would be tradeable in the offseason if needed. I would think that Memphis would want a pick, but making this move saves them millions of dollars in luxtax, and actually gives them more perimeter punch, which they need.
The Suns the their man in Gay, and get a promising young true center in Melo. Boston gives up some perimeter punch in Terry, but they can play Lee and AB more minutes and give the scraps to Barboza. You've got to give something to get something, and there's a more glaring need at the pivot.
The other thing the Cs could do to entice the Suns is to take on Beasley, who has 2 years at $6m after this one. Green and one of Lee/Terry/Bass should get it done.