[Anto Modded]

I have a 70 - 300 sigma f/5.6 I find im running out of light when a rain shower or even on a dull day and with the winter very very close it aint gonna improve. What sort of lenses should i be looking into buying next. I was thinking of a 70 - 200 f/2.8 maybe. Anyone know what the most poular lenses used for motorsport are. I also aint made of money either thats why i tend to go for sigma. Any help and advice would be great. Camera is a 350d by the way