[2006Moy]

ok the cheaper way to go is ignore the rear speakers they are for rear fill anyways. Get a decent enough set of drivers for the door and tweeters, amp then a sub. Polk has some decent/ok stuff Hertz is real good. Amp is the part that gets you. a Good set of components up front can be around 500 amp is up to 1k, a decent sub with box few more hundred. You can easily stay under 2k.

Also side note check to see if on parts they do a price match if so price our the equipment they quote u on dealercaraudio(dot)com. Also absolutely do not change speakers to higher end stuff and use the stock amp you will fry them shortly. Underpowering speakers is a short life. Would help to know what you want to spend as a budget, might get some more advice on equipment etc.