I am running two 12" L7's dual 4 ohm, and if you want to run them at 1 ohm, run them in parallel. As far as an amp is concerned, your budget will dictate which amp, but some good choise are:
Orion 1200D
Diamond Audio D5 1200.1
Kicker KX 1200.1
JBL 1200.1
Crossfire 1000D (this is what I have)
Hifonics Brutus BX1500D
Memphis MC1500D
There are many, many more, and I know that Planet Audio also makes a mono amp in that power range, although I am not sure the model number. I would recommend any amp that is mono and 1 ohm stable that puts out between 1000-1500 watts rms. Rockford mono amps are not 1 ohm stable.