There's a premium on GSRs because they're hard to find in the massive sea of all the RS/LS/GS models out there, not because it was in a movie.

Anyway, expect to pay a little over KBB or Edmund's private party value, whatever that may be. You also should have the car checked out at a qualified Honda/Acura shop before purchasing it. Even though there's the traditional "Hondas are reliable" reputation, the car is still 10 years old. Stuff breaks, stuff wears out, maintenance schedules get forgotten by the owner(s), etc. Best to know what you're getting yourself into.