I'm buting the Rebel XT the next time I find two nice stackable Dell coupons that I can use for it. Dell only sells the XT body, so I'd need to get a lens. This'll be my first and first time using an SLR. What lens should I get that won't make me poor but something I won't want to upgrade after a week? Stick with the kit lens (if it's available on Dell's site) or get something else?