Sure, Canon (and Nikon) make a long list of top-end lenses - but, in reality, only two are needed for over 95% of photojournalism.  And there is no substitute for either; both of the Canon ones are weather-sealed.  They are the 24-70 f/2.8 “L” USM and their 70-200 f/2.8 “L” IS  USM.
   “Weather-sealed” means I’ve shot stories with each in the rain - without trouble, without damage to the lens or dSLR that it was on.  This is essential if you have a top story to cover and cannot put it off until the storm ends.
   That wide maximum aperture means you can achieve nil-depth-of-field effects for movie-poster-like photos that the subject seems to pop out of - with the subject in razor-sharp focus and even very-near objects a blur (photo below).  That’s why the 24-70 f/2.8 “L” USM is the go-to lens of wedding photographers.  It also means you can shoot in dim conditions without flash - essential for weddings, as many churches ban flash.
   Used, each is available at large savings.  So save up for one of each - and scrimp on anything else, including the dSLR body itself..  A 7D works fine with those two lenses - and a life-size 20”x30” print shows it, looking just like the subject is in your living room!

Marine veteran at Memorial Day commemoration, 
Graham, N.C. 2013.
70-200 f/2.8 “L” IS USM  lens used.