I would say to quit looking and to get an aftermarket head unit. ALL oem audio equipment sucks...no matter how top of the lie they claim it to be. It's the top of the line piece of crap. Go to an specialized audio shop to look for your equipment. All dept. stores, like Wal Mart, sells crap for car audio. My saying is, "If you buy cheap stuffs, expect cheap results." Especially for car audio equipment.
Check these sites out...it is a good reference.
http://www.bcae1.com/
http://www.termpro.com/articles/articles.html#How
If your headlight dims with the bass notes, the “BIG 3” might work. If not an H.O. alternator will be needed, or else be prepared to pour a lot of $$$ for batteries.
This site explains the "BIG 3" upgrades.
http://www.sounddomain.com/ubbthreads.php/ubb/showflat/Number/312025/page/1