i have 2 12" rockford fosgate p3-412 and a boss NX2000.0 amp should i wire it to

[RobertMiller]

2 ohms? or .5 ohms? 2 brand new rockford fosgate P3 412 with 500watts rms and 1000watts each at peak, so i bought a BOSS NX2000.2 2000watt peak and 1000watt rms, the amp is running with 4 ohms at rms and 2 ohms at peak... would it be better to wire my subs up as 2 ohms or .5 ohms or 8 ohms....
please tell/
thanks, robert