I am a freelancer for my local paper and I am looking to upgraded to the 17-40 L lens for team trophy shots over my 70-200 non IS 2.8 and my Sigma 28-70 2.8 glass. I am asking for your assistance in choosing an inexpensive lens. Is the 17-40 a good choice for the money? Thank you all for your assistance and I apologize for not being computer literate enough to find if this is a repost. Please forgive me.