with a duel 2 ohm sub you can wire it down to 1 ohm, lower ohms ohms the less resistance and easier it is to power. so go with a duel 2 and find an amp that is stable down to 1 ohm, and rated around 350-400 rms at 1 ohm.
i would suggest going with a more stable sub than that.check this sub out, it is built like a tank, cost less, puts out more power. this sub is rated at 500 watts rms and can handle 650 watts with no problem.
SSA Store - Sundown Audio SA-8 Subwoofer
and either way you go this amp will do the job, and do it right. it can run at 550 watts without any issues.