1500 - 2000w and $350 per piece?
Pair of:
Sundown SAZ-1500.1D's, used
Audioque AQ1200D's
Audioque AQ2200D's, used
MBQuart DSC1500.1D's
MBQuart DSC2000.1D's
Audiopipe AP15001D's
Or you could just get a single:
Sundown SAZ-3000D/SAZ-3500D
Audioque AQ3500D.1
Crescendo 3KWP
Crunch GP3000D
Audiopipe AP30001D
I hope you have the electrical to back it up. The single amp route would be my choice - there are a ton of 3000-4000w amps for sale RIGHT at your price point over at CACO. In fact, there's a SAZ-3000D for sale for $525 SHIPPED right now, and an AQ3500D.1 for $600 SHIPPED! Both of which are CHEAPER than your $700 price limit for the amps.