Well, you have MANY options. With a question this open ended, I assume you are looking for opinions, so that is what I will give you.
Not sure how the voice coils are set up, but if they are DUAL 4 ohm (most likely) I would look for an amp that will run 1000 or more watts rms @ 4 ohms (I like headroom) and wire the VCs in series-paralell. Furthermore, I would look into the older American made amps (PPI, Orion, PG etc.).