lens for football (soccer)

Hi guys
just an opinion
I have a D700 and several lenses, not that good, from the film cameras I had.
I have a 70-300 from Sigma but a cheap - lens, optics and so

I will be photographing my kid a lot next season (goalkeeper) so I need a opinion about a good (but not TOO expensive, at least not with a pro price...) lens to do it - a zoom 70 or 80 - 200? a Nik 300 f 1:4 used ?

Thanks