Even with all the likelihood of a Getzlaf rebound (from a poor 2012 season), Luongo is still an elite goalie. The center position is very deep this year. You can get a better return for Luongo. Realistically, though, his value is low right now, and if you drafted him, you should feel committed to sitting on him for a while.
Also your centers are not WEAK enough to aggressively trade a goaltender, which is a position you are not STRONG enough in.