why only 3000 watts peak? I seen some CVX's take 5000 Watts peak each...
But for real dont worry about peak numbers they BS, those CVX are 750W RMS each, meaning they can take 750W continuously for a long period of time without damaging the sub. SO FORGET PEAK NUMBERS AND LOOK AT RMS NUMBERS
So you should be looking for a amp to do 1500W RMS @ 1 ohm.
I recommend a Sundown 1500d, they can be had used from here for around $350, and from what i hear, they are the best amps out there. Basically half of the members on CA have one.