The KitchenAid - Kitchenaid 5 Quart Tilt-Head GlassBowl with Measurement Markings and Lid is the item my kitchen has been needed.  Not only are the measurement markings extremely handy, the bowl with lid allows me to not only use in the baking prep but also can serve as a storage container.  I also like that it is clear in color so that you can see the actual product made.