I currently have 2 10" bazooka subwoofers with a 350 watt amp 4 4" infinity and a Sony Xplod headunit.

Now i already have a headunit picked out and i found a custom sub box for the back of my car for $100 and its 5/8" MDF board and can fit 2 12" subs

Now im a fan of kicker but im open to other suggestions as to the best subs for not to exspensive and same with the door speakers. also would need an amp that will work.

 

I am huge on rockford fosgate when you say not costly how much you talking 2 12" p2s with a p500-2 would sound also and wouldnt cost too much but i dont know how much you are looking to spend i thinking saving and getting good stuff is the key to good sound sony wont ever match the sound you get from a higher end company But kicker is pretty good to i cant lie i have heard so crazy stuff from them also what kinda music do you listen to if it is like rock and stuff i would stick to 10" subs they are just better at that stuff but country and rap 12"s are pretty good at

 

I listen to Breaking Benjamin and stuff likethat also Metallica etc etc.

Ive been doing some thinking and there is nothing wrong with my subs or my system except maybe two blown speakers. so i think my money would be better spent on say 18" C6 Z06 rims?

 

it would be better than a sound system. but if the wheels you got on now arent bad, you could save up either way. neither is a necessity. i would look into cerwin vega for the subs and amp, - cheap, and very underated. hits pretty hard. Rockford Fosgate is your best bet if you can afford. thats pretty much top quality. but for a total sound upgrade. look at boss audio. the diablo subs are nice, along with the speakers. i was going to get a brand new headunit-4 6.5 inch speakers for about 150. check onlinecarstereo.com. very cheap. very very good prices and big selection.