This should be in the Auto forum...Anyway, the general rule is, you should get the best tires you can afford. As far as bigger name companies America's Tire Company (aka Discount Tires) is reasonable and usually very nice. As far as used tires they usually come with a 30 day limited warranty, you can visually tell if the tire is ok or not, many times the used tire theyre selling are from cars people got rims for, or full size spares people didnt want, they are often a good value. I recently bought a used tire for my girlfriends Infiniti, the new tires were $97 each, the used one was $27. I would say if you can get a 30 day warranty go for the used tires.