Hi I am thinking about renting a lens for some of my weddings coming up that will be in dark catholic churches where flash during the ceremony is not permitted. I also want to check out some other lenses to see what I may want to purchase for future weddings with the same conditions. I am shooting with a Canon XTi and right now I am using the kit lens. My rental options are: (all canon) 24-70mm EOS EF F2.8L, 24-70mm EOS 2.8L USM, or 50mm EOS F1.4 What do you all think I should rent? Obviously I would practice with it and I have a back up body so don't worry.