you need an amp that does 800 watts rms at 2 ohms
i'm currently running an elemental designs nine.1 amp at 1 ohm putting out 1200-1400 rms. this amp does 900 watts rms at 2 ohms, so this would be perfect for your sub, its an awesome amp, i have yet to have a problem with mine
you can get one on elementaldesigns.com for $195, an amazing price if you ask me...