This is just my opinion so take it for what little it's worth. I wouldn't put in the 6X9s. I'd either put the money into better front speakers or into some woofers.
JL Audio makes great products, but they also demand a high price. There are reasonably priced alternatives that would yield some great sound - of course it all depends on your taste & budget.
Here's a couple of sources/items for you to consider:
http://www.thezeb.com/CDTAudio.aspx?...=Cl-61a&cl-61t
the silk tweeters give a smoother sound, titanium a brighter sound.
http://www.thezeb.com/Clarion.aspx?R...anufacturer=10
Clarion amps are the same as a considerably higher priced "enthusiast" amp company (Arc Audio, KAR series amps).
Pioneer woofers are arguably the best bang for the buck of any major OEM, but for about $160 I think I'd buy this (today anyway, tomorrow???)
http://www.partsexpress.com/pe/showd...number=295-404