Per Cooks' Illustrated testing:
KitchenAid KSB580CR Custom Metallic 5-Speed Blender, Chrome or KitchenAid KSB560OB 5-Speed 56-Ounce Blender, Onyx Black
Highly Recommended
A large, powerful machine that aced our three key performance tests. Ice was quickly pulverized into snow, smoothies were lump-free, and hummus was perfectly consistent. Although the blades could not be removed, the entire jar is dishwasher-safe. Jar Material: Polycarbonate. Capacity: 56 ounces