I don't know what to look for either. And I don't know how you intend to use one.  But one thought crossed my mind, as I looked at the pic on Amazon......   that handle on the top looks like it is plastic.  If you intend to put that Dutch Oven inside an oven,  that will not work. 

An internet search turned up this one from Lodge.

edit: I see now that others have suggested Lodge also.  I still would be concerned about having non-metal handles.