1. Taxi driver
2. TGTBATU
3. Mad Max 2 aka The Road Warrior
Those are my definitive top 3 but after that I can't really put the rest of my favourites in strict order as it's too close to call most of them, here's some of the top contenders though...
Aliens, Chopper, The Wanderers, T2, Thunderbolt and Lightfoot, Goodfellas, The Thing, King Of Comedy, I Saw The Devil, Once Upon A Time In The West, The Keep, Ringu, Samsara, Baraka, Dredd, The Crow, Leon, Predator, Cape Fear (Scorsese remake), Platoon, A Bittersweet Life.