Definitely bring Gortat back. He's not a star by any means but he's easily a top 10 C in the league and it's just too hard to find even average Cs let alone good ones.
Ariza...I like him but I think we have to let him walk. If we resign him we're basically capping ourselves with this roster and being a perennial 45 win team. If we want to reach the next step we'll need some flexibility, and gamble on Otto Porter being at least a good solid starter.
"I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use." - Galileo Galilei