The OptionAudio OAK1200 amp does 1200rms (rated) at 1ohm and 700rms at 2 ohm, It will run these subs nicely. Wire all your subs in parallel and you will get a 1.3333333333 ohm load.
Wire the subs like this:
You can buy the option audio amp for around $350, they will be advertised at...