Quote Originally Posted by A.P. Photography
The 70-200 F2.8L over here goes for $1200 without IS but is one of the sharpest lenses in the cannon line up, plus the F2.8 allows you to shoot in lower light with a decent shutter speed.
Quote Originally Posted by Mr. Nemesis
Either way id look into a Canon 70-200L.
Agreed. If your going to shoot mostly motion and want a fast crisp lens grab the EF 70-200 2.8L IS USM. The feedback is great across the board for this glass. I believe Jamie has one if you want some local feedback…

George also stated a prime is a good way to go (actually it is the best) but there are a couple of draw backs to primes when shooting motion and car events, often you’ll miss that shot you really wanted because you had the wrong prime on the body or couldn’t change it fast enough, and the other is the contamination element of changing a lens in the open…

T