I would say you should go with a Cadence DCA-1600.1 , this is a SPL Competition amp and it will help u alot in the future with newer subs and they are very reliable . 1600RMS @ 1 ohm . Heres the link if u want to take a look Cadence DCA-1600.1 - Cadence 1600 Watt 1 Ch Daytona SPL Competition Amplifier

For the same price if u go with a Kicker u will get 1000RMS @ 1 ohm and if Hifonics then its pretty easy to tell that Cadence is way better then Hifonics and is more reliable .... I have used one of their amps and it was very nice but was not enough power so i sold it to my friend who didnt know about amps alot so i kinda made money of him lol

 

Crunch GP3000D check that one out too , but its power hungry u need a big alternator for that kinda suff , Great amp though same level as hifonics but i dont know if their reliable i would still go with Cadence