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@Well_is_it
If you want good Dof for cheap, the 100mm f2.0 will get you a similar effect with slightly faster focus tracking than an f4 lens, and probably more accurate too as the af sensor will have more light to work with.
70-200 is a really good range but at f4 on a crop body, it's not going to be as close to that shot as it could be.
Of course, using a prime isn't as flexible and you'll have to work harder to get the framing right but if you're shooting a race, you should have a fair few chances to find the right spot to camp in.
To get really geeky about this - the shot above was taken at 142mm on a 1.3x cropped sensor at f3.5 so on a 1.6x crop camera, that is basically 100mm f2. Or close enough anyway.