i have a canon 50D and i will be buying a new lens soon and i was wondering which is better, (keeping in mind i need reach, its for wildlife photography) the sigma APO 70-200mm 70-200 f/2.8 EX DG OS HSM (with a sigma 2x tele converter or less) or the Sigma APO 120-400mm f/4.5/F4.5-5.6 DG OS HSM. A need something around 300mm, and i was wondering which one people would go for, keeping in mind IQ and all. I cant really go over $1400
thanks
thanks