At a minimum Perkins would have to be added for both salary and because he is a bad contract. I think OKC would probably need more young players
This works financially and would probably be a pretty fair trade for both teams
Rondo, Garnett, Green, Bradley, Melo (or sullinger)
for
Westbrook, Perkins, Lamb, Sefolosha, Collison
I'd do it as Russ is a much better player to build around than Rondo. Boston would still be pretty good next year with Perkins, Sullinger, Pierce, Sefo, and Westbrook along with Collison, Lee, Lamb, Bass, and Terry