It doesn't matter if you end up with a jabillion rms amp or a 1000rms sub. As long as it's gains are set accordingly it will only put out a certain amount to the subwoofer. Amps don't bow subs idiotic people do. My advice, get a ZX because if your like anyone else on this site you will most likely upgrade, so give your self room to upgrade. Just set your gains right with any amp and you'll be fine.