It appears that the OP has left the building and forum. I tried to post a pic that I took with my 40D and 100 IS L Macro.
This lens would work hand held for taking pics of models. A 7D or newer 70D in Al Servo for panning race cars. I have
gone over his $2,000 limit. He may not have the funds to make a purchase. Either camera would be a good starter.
I think the 70D might be the better choice.