Sarah, am I right you can't get a normal drivers licence due to your vision impairments? I seriously doubt that CAMS will grant you a track licence if that is the case. I'd look into this first, before you look at a car option. And it will be very difficult to find something that can be all 3 cars. Something that can be good at 2 of them, and just pull off the 3rd is possible though... good luck