I need all the help I can get! I really don't know much about cameras but my boyfriend is a professional flat track racer (motorcycles) and I love to take photos of him. He generally moves at speeds of 100mph and I want a camera that I can take amazing quality photos with as I'll be using them for advertising in magazines, so they need to be nice crisp photos. I'll be reproducing them in sizes varying from 8x12 and possibly up to a billboard size.

Any help please???

Thanks!