Take it from someone who has had both tinted and untinted windows in the scorching Texas heat. Get the tint, it WILL make a difference. Both in the comfort level in your car, and in the lifespan of your interior. Tint not only blocks the heat, it reduces the UV that enters the interior. Less UV = less damage to plastics and cloth.
I wish I had the money currently to tint my windows. Another summer is fast approaching, and 130�º temps inside are not uncommon.
