I doubt Jimmer will be available at 14 b/c the Jazz will definitely take him before that. And I would hate to "trade up" just to get a player I doubt will see many minutes and doesn't play good defense.
Morrey as a whole has been overrated. Its nice that he gets some value here and there, but you can only be average for so long. Stats can't tell you everything about a player, and your job as GM is also to SELL the idea of playing for the Rockets. He's not a salesman (like Riley, etc). Houston could be a good place to go for many free agents, but it doesn't seem like Morrey has created buzz there.
If the Celtics trade up, I hope it is ONLY for a big man that can play some minutes, be a workhorse on defense, and can finish around the rim.