Here is a little tip that you should pay your upmost attention to...And it may sound weird at first, so just hear me out.
The Installation and Box are as important, if not more important than the sub and amp themselves. I would rather have a 600 watt setup that was well put together and an enclosure built specifically for the sub(s) than a 1200 watt setup that involved a shitty install and a pre-fabricated box (the ones that you can buy at Walmart, Bestbuy, etc.). I highly suggest you buy this kit with a 120a fuse -
Car Audio Wire. You may not need that large of wire now, but you will thank me later when you decide to upgrade. Also, buy some extra 1/0ga from them, maybe 15ft or so, and do this -
http://www.caraudio.com/forum/wiring-electrical-installation-help/152355-official-caraudio-com-big-3-thread.html. Again, you may not need to do this now, but you will thank me later. All of that wiring, along with the big 3 mod will keep your battery voltage stable, which will keep the power to your amp constant (and feed it more power), and it will highly reduce the chance of you blowing the amp from voltage-related issues.
Either do a helluva good job installing everything, or get someone you know to do it for you. If you don't do a good job, you will open up more possibilities for blowing your sub/amp, and it won't likely sound very good in the end. Just as well, make sure that an experienced person tunes your headunit/amp for you, and pay attention to how they do it so you can do it yourself later.
Now that that's out of the way, spend your money on a decent sub/amp setup. I HIGHLY recommend the AQ1200 & SDC2.5 combo. The subs may only be as good as the Type R's, but you gain attention from your friends when you show them a subs they have never seen before. The amp is one of the best bang for buck deals out there, and is a considerably better choice than the two M500's. The Alpine amps are nice, but there would be no good reason for you to spend twice as much on them to get the same power. Plus, it is much more practical to run one big amp than two small ones. As I said before, make sure you find someone to make you a box designed specifically for those subs...ask around the forum for the proper internal volume and port displacement.
Lastly, Capacitors are a joke. They make little difference to your electrical system. You may think they are helping save you alternator, but they are actually doing quite the opposite. Instead of sustaining a set voltage like a battery, they drain and fill themselves constantly, which taxes the alternator more than it helps it. Batteries will cost you near the same amount, and be an enormous improvement. Don't listen to what any of your friends might say, capacitors are total ****. You probably won't need an extra battery now, as long as you do the Big 3 mod.
Hope this helps! Everyone has to start somewhere, so I understand where you are coming from. I just would hope you can skip past the stages of learning why shitty installs waste more time than they save, why capacitors **** in comparison to batterries, etc. I promise that if you follow through and do everything I said (buy the wire kit, do the big 3 mod, buy the AQ1200 & SDC2.5's, get everything installed and tuned by someone experienced, and get the sub box built to the correct specifications of the subs), you will not be disappointed. It will bump pretty
damn hard, and sound pretty good in the process. Expect a good amount of roof flex, and a lot of surprised faces from your friends. They will think you are running 2000 watts on a pair of 18's //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
Good luck!
