Wassup spongerx,
For a decent sound system you need to fork out the dough. There is no sense in doing a half way upgrade. Where I come from you either go big or go home.
It sounds to me, that you want a powerful full sound. My suggestion is to buy a HU, followed by amps & speakers, and top it off with a preamped sub.
There are other things to add as well, like a seperate EQ or even a power capacitor.
I like kicker amps, MB Quartz speakers, & JL subs. But shop around and see what catches your ears. I had this setup for sometime and it was a headturner.....always.
It always is better to buy the system from the same maker because they are made to complement each other.
N E Ways,
Good Luck
Hayn4R
2005 sport v6 4x4 silver