It really depends on the situation for that. Are you in early, middle, or late position? Are you on the small blind or big blind? Has anyone bet and what do they represent? Also, is this a cash game, or tournament? Do you have a read on the players that are in the hand (tight, aggressive, loose?)? If it is a tournament, are you near the money bubble and what are the blinds?
I know that is a lot of questions, and I am sure that I may have missed some but these factors have to be taken into account before a definitive answer can be provided.