Check xpel.com to find a local installer and then do some reasearch to find people who have used them. From what I read, the best films are probably the latest wave from 3M with Avery being a close second. Each film type seems to have its high and low points though.
Issues to look at on various films are things like resistance to yellowing and degree of orange peel visible in the film.
Best of luck in your search!
-GT