Don't listen to Nic haha :\
Option Audio equipment is highly recommended around here as excellent value gear. You have two options.
The first option is their 600W RMS monoblock (which produces 600W RMS at 1 ohm):
From here for $249
The 600W amp is perfect for your subwoofers and is able to power both with 300W RMS when run together in parallel to produce a 1ohm load, however it leaves no headroom if you wish to upgrade to more power-hungry subwoofers at a later date.
The second option is their 1200W RMS monoblock (which produces 1200W RMS at 1 ohm):
From here for $339
The 1200W amp is more than capable of powering your subwoofer, and allows a lot of headroom if you wish to upgrade your subs at a later date. For only $90, the investment is worth it.
To ensure your amps don't over-power your subwoofers, you will need to turn down the gains and ensure that you don't hear the subwoofers struggling at a higher volume.
If you need advice on how to set your gains or how to wire up the subwoofers in parallel to produce a 1 ohm load, just ask.
