I am totally new to this, and i've read bunch of information about speakers, but still its not all that clear to me especially amps.
Here is the parts i am planning to order for me 2005 Acura tl with navi

Polk Audio DB351 3-1/2" 2-way Speakers - For center channell speaker
JL Audio 8W3v3-4 8" 500W 4-Ohm Car Audio Subwoofer - To replace factory sub

Alpine SPS-600 6-½" / 6-¾ 2-way Car Audio Speakers - to go in the rear deck

Alpine SPR-17S - replace front door speakers and tweeters

and Alpine PDX-5 Class D 5-Channel Car Audio Amplifier for speakers and sub

this whole setup costs around 780$
any advice on what should i change ? or what to get within that price range or maybe 100 more than that
thank you all

 

replacing the sub in the deck isnt going to do much, it's going to sound like crap being free air. Your best bet is to go with an uncald4 box and a good sub.
Also if you are amping the sub, you will need a seperate one, the 5 channel one won't be enough to for the 500 watt sub...

 

You don't need rears or a center channel.

 

that's if you have a higher level setup that's properly tuned and such, the OP isn't going to that degree of higher tuning for under 1K...

 

It's still possible. i'd throw most of my budget @ a good front stage then go from there.