upgrade front stage?

I have a ford f150 Supercrew--- I currently have Boston Acoustics RC820 component speakers in all 4 doors..... Here are the speaker specs and I have the tweets flush mounted high in the door corners:

5 x 7" woofer with AMD

Now I want to UPGRADE my front stage sound with better component speakers and replace the front stage Bostons......

I HAVE $600 to spend on a set of comps.... What should I get to have the JL 450/4 push?

Any thoughts?

Please do not post multiple threads with the same question.  Thanks.

Go shopping and listen to what is available in your area.  Buy what you like from a local shop.

What's the point of going shopping in my local area?  Most of the "good" speakers can't be had at a wal-mart or autopart store--- That's what is in my area.......Asking others their opinion/ places to buy is the best method I know

Someone else's opinion is just that: someone else's.  Only your ears can tell you what you like.  Where do you live?  I cannot believe there is not one car audio shop in your area.

first u had to go somewhere to get the boston's and the jl amp so where ever u got the boston's try to see if they have the boston pro6.5(3) its consist's of a 6.5" midbass, 4" midrange, and a 1" neo 3r kortec dome-flush mount tweeter and i set them up in their own enclosure (in a boat thats why) hooked up to a crossfire vr804 class a/b out put is 100Wx4 rms @4 ohms the set will present a 3 ohm load to the amp so u will get a little bit more out of the amp and the customer that i installed it for loves them he listens to the same stuff u do so see if u can find a set of those to listen to them retail is $500-$600 hope that might be a guide to ya