I'm in that area often too, there's plenty of nice Mustangs around. Someone in Lake in the Hills has a white GT500 with blue stripes. If you see a silver '06 GT with painted stock side mirrors and Midwest Racing on the window, that's me. I live just a few minutes west of there off Square Barn Rd.
There are a few nice mustangs in algonquin. I was there with my 03 vert but I am at school now. I think there are about 4 or 5 terminators that I have seen regularly in town. The guy who has the white\blue GT500 is pretty cool.