I actually read an very interesting well written article that I agree with on Celticslife.com.
I do believe a trio of Rondo, Sullinger, and Monroe as our PG/PF/C will be amazing. Monroe isn't amazing defensively, but that is also because there isn't enough space or enough time for him to develop that. Monroe can learn how to defend especially with Brad Stevens making that any important skill to learn in any of his players.
Monroe and Sullinger will both have or at least give us the window of 6-7 great years of front court versatility, great passing, high IQ and intelligent big men, with great knowledge of the game itself. With the addition of their young promising potential and age, I don't see why these can't sort of become Z-Bo and Gasol. Monroe may not be the best defensive anchor like Gasol, but they both would match each other well.
I'd give a 2015 1st pick of ours or Nets, Green, and possibly someone else. I'd like to keep Bradley if we get Monroe.