I used a Nikon D300 for my grand-daughter's soccer games and I had two lenses that worked great - the DX 70-300mm and a 70-200mm f2.8 VR. I used the 70-200 for most of my shooting until she hit high school where the games were started after so I bought a Nikon D3S body and I lost the advantage of using an FX lens on a DX body (crop-factor) so I bought a Sigma 120-300mm f2,8 and that along with the high iso ability of the D3S allowed me to shoot under the crappiest of lighting.
Unfortunately she'a plying soccer for an east coast college where she was the starting mid her freshman year.
The 120-300 f2.8 is just about the perfect soccer lens - I will be putting all of the gear up for sale and if you have any interest just shoot me a PM with your phone number and I'll give you a call.
