Actually, I like hiring one or so nearly green college grads of the right sort, who are willing to be mentored. As long as they are self-directed, can start working given basic directions and then ask you the right questions (my favorite example from a guy who'd only done C++: "where is new in C?" "ah, in C we malloc...."), they can be very productive and follow your vision. And as they learn, help to refine it.

I believe in trying to balance your team. A very few green apprentices (too many take too much time), enough seriously experienced masters (you're not likely to get many) and then journeymen in the middle, all of these aspiring to reach higher levels.