if you don't to spend a lot, get a lanzar OPTI1000.1D amp. you can find one on ebay for about $189.99+20 shipping. sure its used, but it's been refurbished to work like new. rated at 1000x1@1ohm, you can't go wrong. not to mention they are a tad bit underrated. subsonic filter? yea..they got one of those. the only thing they need is an external fuse, as they don't have an internal fuse like most other amps.
if you're going to buy that amp, i highly suggest you buy it from a guy name audioblowouts
i recommended this amp to a friend and he loves it.