I agree with Ard...
There is only ONE thing that is in contact with the ground on your very nice and expensive vehicles, and that is the tires. Why would anyone try to, "save money," on this. I am not saying you should try to spend the most money that you can, but you should research the BEST tire available for stopping, traction, etc. Then shop around for the best deal. Tracking is one thing where you are there to waist them, however if you blow a cheap tire and crash, well then, there you go...