I upgraded the headunit to an alpine cda 7894 which cost $260 off ebay. I put that in alone first, and was amazed at how much better/different my OEM speakers sounded, and decided to keep them for now. They were much louder/crisper with 60w per channel versus the pitiful OEM radio currents...
Then I added a JL 10w7 that was $410 off ebay with a custom sealed box and an alpine MRD-M500 mono sub amp which works GREAT for $290 off ebay as well. Spent about $70 on high grade wiring and fuse setup, then about $100 install altogether.
YOu can find comparable prices if you're patient, it took me a month or two to get it all lined up.
HU-$260---retail: $350-$400
SUB-$410--retail: $600-$700<without box>
AMP-$290--retail: $500
MISC-$170
total $1130--retail:$1450-$1600
I realize that's a little over what you were saying, but other subs can be had much cheaper than the JL, but damn, I like that JL
, and the car sounds awesome, gotten lots of compliments on the versality of the setup and is easy to control for different types of music.
The setup also doesn't take up as much trunk space as some, although I don't like the way the amp sits on the side, am going to have that re-mounted on its end so its more out of the way.
Here's a pic below... give the OEMs a shot with new head unit if you haven't blown them, you may be surprised and can spend the extra dough on the sub equipment....