I’ve decided to give myself a late present and purchase the Canon EF-S 17-55mm f/2.8 lens and a few Kenko extension tubes. Based on everything I’ve read, the 17-55 is probably the best walkaround lens for a crop camera like my 40D, and it will give me a wider angle lens than what I already have.
Which means I’m selling my Tokina 19-35mm f/3.5-4.5 on eBay. If you need a cheap, decent wide-angle lens for a Canon EF mount, check out the auction before it ends next Sunday.