California, AZ, Nevada--anywhere there is little rain and no snow. Watch the mountain areas of course.
CA cars have the added bonus of having to have been smogged every 2 years. That means it has to be OEM and has to be running right or they have to fix it. Be sure to demand a smog cert if you buy a CA car.
You may move it to a non-emissions state and modify it, but at least you'll know what you are starting with.