both of you are correct..
but it would be better to go with a mono amp, with more power then a 2 channel amp and bridge it down to 2 ohm's
get a amp with at least 800 rms at 2 ohm's simply because of the fact that the subs read 50-350 rms BUT just about every sub that i have ever sold is rated way less then what it can handle. you could put 450 rms to those subs easily and it would pound hard
hope that helps
kevin