Bryan Carnathan at The Digital Picture published the Tamron 10-24mm f/3.5-4.5 Di II VC HLD Lens review saying that the all kits should have a wide-angle zoom lens in them and this lens just might be the best option for yours.
From The Digital Picture:
The advantages of this lens start on the surface, with a great-to-handle shape and sharp looks. To get great images requires having a lens with you and the size and weight of this lens makes it easy to carry and comfortable to use for even long periods of time. Weather sealing is another advantage of the 10-24 VC, featuring a ready-for-whatever mindset by design. The image quality delivered by this lens competes well against the other options and when slow shutter speeds begin to adversely affect image quality, this lens’ excellent vibration compensation system will, by far, differentiate it from most of the crowd.
The new Tamron 10-24mm f/3.5-4.5 Di II VC HLD Lens is now in stock and shipping in the US for $499.
You can read the full review at The Digital Picture.