o man, theres lots of good amps out there...
First off, are they dual voice coil or single voice coil and what is the impedence on the voice coil(s)?
check out cadence, crossfire, DEI (directed), PPI (Precision Power; might be a little pricey), Kicker, or Orion for some good amp options that might be cheaper
o yeah check out hifonics too
you could always go with a JBL BP600.1, which you can find for real cheap.
good luck.