I think the you should buy aftermarket like: HKSV6SLE, geminimouse said.
I have Alpine in my 6.5'' speaker and regular 6x9'' in the back all Alpine.
I was goin' to buy Panasonic for either the front or the back. But coulodn't find anyone in OKC that sold any.
Also are you running and aftermarket headunit??
If you are, look into any speakers who use the least amount power, and hits the best.
I think all of mine hit about 92-93 dbs.
Now if you have a aftermarket headunit, run a small amp to power the aftermarket speakers.
I'm runnin from my Alpine headunit, for now.
I can turn it up to 12 for the CD player and get a good bass feel in my driver seat.
On the radio i have it to 16 for the bass to kick in.
I'm not sure if you that kind of person who likes to feel the bass in the seat.
But i know i am.
