Instead of hifonics check out the AQ amps. They are similar but higher quality and better reputation. www.audioque.com
It would be much better to amp your speakers to get a louder/clearer sound from them. Its hard to ask which speakers sound better because everyone has their own opinions and favorite brands. I've never heard the JL's, but I'm sure they probably sound good. I would do your research and try to find reviews...
If I were you, this is what I would get.
6 1/2 component set for the front
6 1/2 full range speakers for the back
AQ490 4-channel amp
AQ1200 Mono sub amp
1 or 2 RE SE 12's or 10's (whatever fits)
If you upgrade everything above, then might as well get a new deck too.
Don't forget to do Big 3 wiring.