You can't go wrong with Slipknot's list, especially the glorious Vangelis "Blade Runner". Almost all of Vangelis' film work is recommended. As is John Barry's James Bond series. The list of great film composers is immence, but the best way to get acquainted with this music is to simply pay attention to the score as you watch the film. Luckily, most good scores accompany good movies (do they make them anymore?).
A very short list:
The Wicker Man-Paul Giovanni
Black Robe-Georges Delerue
Ragtime-Randy Newman
El Cid-Miklos Rozsa
Excalibur-Trevor Jones
Fantastic Planet (La Planete Sauvage)-Alain Goaguer
Local Hero-Mark Knopfler
It's great to see you have an interest. Your on the right (sound)track!