I have an MA Audio amp and those things are small and very powerful. I get it new off of ebay with a 2 year warranty from MA audio. My subs are the aluminum cone audibahns also new off of ebay and I bought a box here in town and the wiring here in town also and it all ran me about $375 of course I did it myself its really easy to do, just a little patience is all. I am pushing about 300 Watts a sub and I have 12s. Its really clean and I can make it mean if I wanted to, I like how it sounds doesn't rattle the trunk much.

Also, make sure that you do not get a hatchback box, you can but you might regret it. The hatchback boxes are at a slant in the front. The ones you want are the ones pointed straight back to the trunk like towards your taillights. From the dynamics of the sound waves you will get better response and tighter bass. Just a little FYI