When the weather warms up I'll be adding the following equipment, replacing the underwhelming Bose system in my 2005 Mazda3:
Focals for front doors
Focals for rear doors
Polk amp for speakers
Polk amp for sub
I know its not the best sub, but I didnt want to go balls out as I am not really a bass head - but I wanted enough power and a decent sub, plus I found it brand new on ebay for $100 shipped.
I was going to buy a Q logic sealed box, but I may build a custom one to fit in the space on the right side of the trunk, between the wheel well and the rear of the trunk.
I am also going to build a simple amp rack to hide the wiring and mount it in the trunk, to the underside of the rear deck.
I already received some of the hardware from KnuKonceptz:
The interior noise while driving is kinda loud so to quiet it down I also ordered a 5 gallon drum of Second Skin Spectrum Spray, 100 sq ft of Second Skin Luxury Liner, A sheet of motor mat for the wheel wells, and some open cell padding to kill any panel rattling.