ya they are 100 watts RMS. You wanna match the combined RMS with the RMS output of the amp. your lookin at 2000 watts RMS total, 1000 per sub, so answer taylors question on impedance and then depending on how they are wired you will need a 2000 watt amp. A Hifonics Colossus or Orion 2500D would be good.
Or you can get two amps and have each amp drive its own woofer.