I think Jeff Green has enough value to get the Celtics a non lottery pick (15-30). I'm hoping OKC wants Green and is just waiting until the deadline to see where their 2015 pick is most likely to land. They could protect the pick top 14 this year and top 10 next year. This allows them to keep their pick if they don't make playoffs or Durant/Westbrook get injured again. We have a lot of pieces OKC could want to make a deep playoff run. (Green, Bass, Turner, Nelson, Wright, Zeller, & Crowder)
At the deadline I think we should offer some of the above mentioned players in a deal centered around the contracts of Green and Perkins.
I'd offer Green, Wright, Turner, Nelson for Perkins, Jackson, Collison, Jones. I'd ask for OKC's 2015 1st rd pk too. We could try and snag Jackson for cheap from OKC so we gain his bird rights. That would likely mean adding turner to the deal as well. If OKC fears they won't end up re-signing Jackson, they might pull the trigger.
Ainge should also not hesitate ask for the right to swap the Clippers pick with OKC's in any deal where the C's are giving up the better players.
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Here's my trade proposal (more realistic IMO):
BOS gets: Perk, Jones & OKC's 1st rd pk (lottery protected in 2015, & top 10 protected in 2016, otherwise it becomes two second rd picks---2016 & 2017)
OKC gets: Green, Wright, Nelson
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Why OKC does it:
They get 3 good players that would help their playoff run. PJ3 only has 2 years left on his deal. I think Nelson would exercise his player option to stay in OKC and Green might opt in because he's playing for a contender. Wright could also be re-signed using his bird rights. The only reason they don't do it is to keep up the moral of the team since everybody on the team loves Perk.
Why BOS does it:
We get PJ3 to play the 3. We get Perk who can play out the year at back up Center or be traded/bought out. We also get another 2015 pick. That's 3 first rd picks in 2015. Nelson won't stay here next year. Green is likely not part of the Celtics long term future and has the right to opt out at this season's end. Wright I wouldn't mind keeping but he makes the trade more appealing for OKC since they'll lose Perkins.
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THE CELTICS COULD ALSO FIND A 3RD TEAM (CONTENDER) TO TAKE PERKINS. THAT TEAM COULD SEND THE CELTICS ANY COMBO OF EXPRING CONTRACTS/PLAYERS ON ROOKIE DEALS (maybe Houston would offer Terry & Shved for Perkins, Pressey, & a 2nd rd pick OR Toronto would offer some of their expirings for an upgrade at back up Center)