The last thing you want for sports would be the 28-300. It might be longer, but its 5.6 on the long end. And superzooms, even the good ones, have issues. BTW what ISO were you using late afternoon that you could only go to 1/250? Anyway, if you want longer look at the 100-400. If you want faster look at the 70-200 2.8's. I personally wouldnt get a lens in that range without IS. Not that you will need it for sports, but IS makes it a more versatile lens away from the field.