Stick with a brand like Solar Guard, LLumar, SunTek window films and you will be fine and preferbally with the metal film type. Usually the non-reflective type (charcoal) will not have any metal inside making it not block the UV rays too good and will not block out heat as good as the better quality tints do. These non-metalic films will fade in time and turn to a purple-lish color in about 3-5 years.
Most of these major tint brands offer a lifetime warranty on their window films.
On the price of a tint job? It will determin on if there is existing tint on the car because of the removal charge. But if there is no tint allready on the car then I would say between $120-150. Anyways our cars are alot easier to tint because our windows are pretty much flat.