This is what I consider my best picture. This James Coco at the CMRA Superbike event at Hallet Motor Racing Circuit just outside of Tulsa, OK.
This was shot using Fuji Provia 400F transparency film. It was shot with a Canon Rebel X and a Tamron 80-210mm lens. The settings would have been f5.6 (fast as that lens goes) and probably 1/250th second panning. I also used a UV filter.