sonds like those are the old w6's(dual 6 ohm) if so they don't need that much power a stong 1000-1200w 1ohm stable amp will be fine, like akicker kx 1200.1, or jbl or memphiss 1000d.
Are there legit warranties with OEM when purchasing off internet? If so what site? What about Orion, Phoenix Gold or Kicker online purchasing warranties?