~I would buy this lens over and over again~ VERY comparable to my L pro glass. Superior quality~BUT VERRRY noisy! I can't use it at weddings, it's too freaking noisy! and it is a very searchy lens in low light!
Tamron Zoom Super Wide Angle SP AF XR Di II LD Aspherical [IF] Autofocus Lens for Canon EOS Digital Cameras. Great step-up lens from kit lens. Downsides: AF is noisy, the focus ring is rather stiff & focus ring turns while focusing.