Hello, I'm a bit of a newbie here. Anyways, I purchased a Canon Rebel XS in May and I eventually got the 50mm f/1.8 II lens. I've found that both the kit and prime lenses were excellent for a beginner and I've been able to take wonderful portraits of friends and family. I've been saving up money to buy an additional accessory for my camera, such as another lens or maybe a flash attachment. In general, the main type of photography I do are indoor/outdoor portraits (mostly with natural lighting during the day). I'm looking for something that could enhance my portraits. I could get a better prime lens, but I think I'd like something that could potentially replace the kit lens I have. Any thoughts? I'd prefer to have a lens that can autofocus with my XS. Thank you.