Okay, so portraits are what I want to shoot... but the kit lens that came with my Canon Digi Rebel xt isn't cutting it. My kids are tired of the camera being right in their face, . One of them actually runs when I pull out my camera! I'm looking at the Canon EF 85mm f/1.8 and am just looking for some opinions from you guys about it. Would it be worth it? Do you think it's what I'm looking for? *edited for another question* Would the 85mm be a faster lens too? What kind of shots is the 18-55mm best for?