I have the Cannon Rebel XT with the standard lens (18-55). I am looking to make a new purchase and can't decide between a flash or a new lens (or specifically which lens). I use the camera primarily for taking picures of my daughter. I don't take advantage of all the bells and whistles on the camera (so my next purchase shoud probably be lessons), as I am new to SLR cameras. Does anyone have any suggestions on what my next purchase shoud be?