I have 1 12" sealed and it gets loud enough to exceed my other speakers in decibels, so good enough for SQ. Ported is good as it can get as loud as sealed while using less power (assuming the same sub in both setup). With that said, loud to some people is not loud to others, but I choose one 12". I have the GTO 1214D, $100.
I like 5-channel amps. Small and install friendly. For a budget amp the ASA1100.5x is a great $200 amp.
I use the JBL MS-62C. Maybe you will like these maybe you won't, but this is where I would splurge if you are going to. They can be had for $150-200.
Next step is to seal up those doors. You need some sheet metal, sheet metal screws, and like 4 sq ft of sound deadening to do this.
Knuconceptz has good OFC wire for a good price. Or you can go with welding cable for a bit less: http://www.wireandsupply.com/www_wireandsupply_com_welding_cable_s_22_htm_s/22.htm
Make sure you have a good battery.
You don't need a cap, in case you were wondering.
And the 9887 is a great starting point. I had all of the above installed with a 9887 running it 3-way and enjoyed it quite a bit.
Thank you everyone for the suggestions and feedback. I have an old pair of Alpine Type R 6.5 components that I will be using. A friend of mine has a JL 10w7 3 ohm in a sealed box that he will sell to me for 300.00. I thinking about getting the Alpine PDX-v9 amp. Had the old version a few years a go and they were great, even survived through a pretty bad car wreck.
Couldn't I just seal the doors up with the sound deadening alone? Thats how I did it in the my Civic years a go. I would think that the sheet metal would cause more vibration due to metal to metal contact?
Also, is there a DIY on mounting the tweeters to the side mirror covers? I remember doing that to my civic and it made the vocals sound10x better.