The AAP recommends keeping a child in a crib for as long as possible - even as late as 3 years old. Kids are safer in a crib and feel more secure.
Keep in mind that once he goes into a bed, he'll be free to explore anything he can get to, anytime he happens to wake up. He may start waking up at 2am just to play. And when I say "anything he can get to", I mean it. Babyproofing items are meant to keep infants and young toddlers out of things for the few moments your back is turned or while you run to the bathroom. They will not and are not designed to keep a determined, bored, unsupervised child out of something while you are asleep. When you move him, babyproof as if his life depends on it and find some way to confine him to his room. Secure all tall furniture to the walls (it could tip while he's climbing it), lock the closet door, remove all breakables (glass picture frames, etc).
at 3:12 PM on Feb. 26, 2009