Well first time buying a car system and need some input.

I have pretty good common sense and I'm trying to install on my own.

Im buying this screen for sure http://www.amazon.com/Pioneer-AVH-P4000DVD-2-Din-Multimedia-Receiver/dp/B001604QGW/ref=sr_1_7?ie=UTF8&qid=1314920902&sr=8-7

And thinking about buying these subs http://www.newegg.com/Product/Product.aspx?Item=N82E16882748058

Or could i do 2 of these? http://www.newegg.com/Product/Product.aspx?Item=N82E16882748035

I just need some help lol

Also placement is a key I know that. I have a 2000 Nissan Altima and the only place to put the subs is in the trunk.

http://www.sonicelectronix.com/item_9348_2-Pack-of-Kicker-CVR122-07CVR122.html
http://www.sonicelectronix.com/item_29704_Kenwood-KAC-9105D-Amplifier-Kit.html
http://www.sonicelectronix.com/item_21657_Absolute-PDEB12BK-Black-Black.html(custom made sub box would be better)