I know this isn't the lens lust forum...but this lens would be for outdoor school sports As I see it my choices are Nikkor 70-200 VR Sigma 70-200 Well today, the sigma rep suggested considering the 80-400 OS and then a friend said...how about my sigma 120-300...That's a BFL! It's just back from Sigma after a tuneup, and he never uses it. He claims to have used it strictly hand held for as long as two soccer games. My Sigma 70-300, while a sharp copy, just doesn't focus fast enough for my needs. I'm going to have a tough time convincing SWMBO that I need to spend $1k, much less almost $2k. What say my highly skilled sports friends?