This is basically the same recommendation I made in the other post....
Here is a great little setup if you don't already have an aftermarket HU.
HU -
http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_I D=4951$210
Fronts -
http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_I D=5207$99 (You should have front 6x8's and you can make an adapter very easily to make these work)
Amp -
http://ikesound.com/product-product_id/2213$93 (woofersetc.com will price match)
Sub -
http://www.edesignaudio.com/edv2/product_info.php?cPath=1_21&products_id=31$100 (Dual 2 ohm)
Wiring Kit - $20 at wal mart (You will also need one more RCA)
Box stuff - $40 at most at Home depot.
That comes in at $562 and is an awesome setup for the money, but it has a sub. (A sub is much betterat producing bass then any mid woofer)
If you don't want a sub.....
HU -
http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_I D=4951$210
Fronts -
http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_I D=5207$99 (You should have front 6x8's and you can make an adapter very easily to make these work)
Rears -
http://www.woofersetc.com/index.cfm?...roduct_ID=3077$99 (if you can fit 6x9's and you should)
Amp -
http://ikesound.com/product-product_id/2213$93 (woofersetc.com will price match)
Wiring Kit - $20 at wal mart (You will also need one more RCA)
You could also try to use the stock HU, but why have a poor singal to begin with...
That totals $521.