This is England. Also, Oldboy.
!@#$% yeah man, you're an Oldboy fan as well? <3 that movie *so* much.
Oldboy really should be top priority, but here are a few more you should see:
Battle Royale (nice and violent)
Boogie Nights (about 70's-80's porn industry
)
28 days later (very well known, but great movie anyway)
Bottle Rocket (kinda well known)
Eastern Condors (AWESOME.)