If our draft pick falls out of the top 3, what about this idea:
Sullinger, our 2014 #4-6 pick, our 2016 pick, Gerald Wallace, and Joel Anthony for Gasol and Prince.
Celtics next season (with some cap space available to fill out roster):
Rondo/Pressey
Bradley
Green/Prince
Bass/Olynyk
Gasol/Faverani
Not an instant contender, but an instant very good team with still a lot of draft picks coming up in the near future and enough cap space in the summer of 2015 to sign an impact FA if we desire to do so.
I know posters will want to keep Sullinger in a trade for Gasol but that won't be possible.