Look for the Alpine MRP-M500 on your local craigslist if you didn't yet, great amps and will work forever. I had one hooked up to a 12" type r and it was almost 600 rms @ 2 ohms, which is gonna be what you're looking for. I sold mine on craigslist for $70, and I see them often around my area for not much more, and they're everywhere, most likely you could find one. Good luck!