i was researching telphotos recently and i want to upgrade from my crappy Tamron 70-300 F/4-5.6 i just didnt have the money for a while to now i do. i was looking mainly at the common 70-200 2.8 cuz i need thats wide apeture and need something mainly that focuses faster. Also i was looking at the 300f/4 becasue it has IS so would be sharp and fast at the same time. I am shooting sports andjust getting into photojournalism. I also was thinking of getting something like the 300f/4 then getting a 70-200 f/4 after instead of a 2.8. What are your suggestions. thanks