****And yes - the cheap platic 35-70 that everyone dismisses is a surprisingly good lens - I used to use one as a macro lens when I was repairing cameras to photograph the insides of cameras ****

Well of course the cheap Canon kit lenses can take pictures, but to help the original poster out (or any one else) it's quite simple in that you want the best lens to do the job that you can afford, and some third party lenses are better than some Canon lenses for the same price or a few s more.