The Dark Knight soundtrack (epic 9 min first track) - Hans Zimmer and James Newton Howard
Star Wars - John Williams
Jaws - John Williams
Superman (anything by john williams, really)
The Terminator - Brad Fiedel
Predator - Alan Silvestri (arnie yells, get to tha choppa, the string music starts up loudly and i immediately get goosebumps)
the 28 Days Later theme - John Murphy
http://www.youtube.com/watch?v=KW0RX02SeQw