Learn all about cast iron with the "Le Creuset" Cast Iron Guide: Dutch Oven 5 qt. "Expensive but nothing like it and should last a lifetime! A Dutch oven is the best multi-purpose size if you can get only piece in the collection.
Every serious chef uses his or her Dutch oven constantly, and probably cast-iron skillets of every size too. Lodge Logic has supreme quality products and they are a fraction of the cost of the French Le Creuset line.