Get one with a sturdy wire handle, do not skimp. I made a wooden box to store my dutch oven in. It is lined with burlap to absorb moisture to keep the oven from rusting while stored. I will also put a piece of burlap inside the lid to absorb any moisture inside.
You will find the dutch oven to be your favorite cooking tool for the campfire. I have developed recipes where I can put in the ingredients place the oven into the fire and then go off for a hike. When we return the food is ready.
My favorite is to layer Italian sausage, tortilla shells, I use corn, chicken pieces, more tortillas, then veggies of choice. I have used sliced potatoes, carrots, squash, onions, broccoli, tomatoes, and cauliflower. When we are camping we visit the local stands and buy whatever is fresh. Season it to be Mexican or Italian whatever your fancy of the day. Cover and place into the coals. Cover the top with red hot coals and bank up on the sides. I'll let this cook for about three hours.