I've got an idea. Why not save a ton of $ and just take your car to the track? I bet my 2010 STi cost less than both of those simulators and I get real people to scream into my ear when I take a corner too fast.
The Simdeck Formula simulator takes this a lot further - uses the ICE Digital LENS projection screen, petrol powered car, sensor vibration and takes a few minutes. The screens used are minimum 82" so the drivers view is fully immersed. With a 20" monitor you might as well just sit on a desk or seat frame. You can see it here www.simdeck.com