I recently bought the Canon EF 50mm f/1.4 lens for my Rebel XT which I love. I'm looking to replace the Canon EF-S 18-55mm f/3.5-5.6 that came with my Rebel XT with a Canon EF 28-105mm f/3.5-4.5 II USM. Just wanted some opinions on this lens for everyday use. Don't want to spend more than US$300. I've been told the macro EF 100mm f/2.8 is a lot of fun but that can come later. Thanks all.