Dude I have had my dash apart and redone the radio setup a dozen times, adding the most expensive speakers to the current setup will net MAYBE 1 volume click of difference at all which is all to the high end of the range, the low end will be gone, sure at max volume you may be able to hear or feel a few crisper(not louder) hits, but it will cost all of the other lows and without a proper crossover/amplifier, the factory setup/speakers ain’t too bad, that being said, if you want to pop your door panels and giver it a whirl, do not spend anything over 75$ for a pair, with RMS wattage not above 50.
Problem is most companies sell either components or two/three way 6.75”s/6.5”s(The both fit)
Components will get you a crossover and a single piece main driving speaker, but good luck getting the tweeters swapped and wired.
When I started I bought Polk audio somethings on amazon which were components, and threw the tweeters/crossovers in the trash knowing I would be using the original amp and its tweeters/xover.
Reason being that I just refuse to ever accept that putting a tweeter in the middle of the bass driver was a step forward when I had tweeters in the dash..Plus I knew from prior experience what underdriven three-ways pointed at your ear can do to the enjoyment of the music(hissssssss)
I would either go all in with a WIRELESS CARPLAY unit and a proper dual amp or 5-channel setup and replacing all the speakers.
OR spend less that 100$ total and only change the speakers, maybe.
I went all in, eventually running 110RMS 6.5’s and dynamatting the world, this guy found a way to fit a JL 4-channel amp BEHIND the double din reciever in the dash! Yea it can be done and it is nuts, i had to pull the whole dashboard out(never again)
I also put JL 6W3s in the rear corners, using frame bolt points where I swapped in longer bolts that secure the little cubes in their place, the spot between the IMA battery and the very rear of the car has a JL monoblock stuffed in there, notched the carpet, tried to cut the trim pieces best i could(aint perfect)
I would rather remove the entire interior and floor-liner than ever disassemble the dash that far again
(ever pressure wash the floorliner? works great cept ya gotta take it out first. yea, i am weird I know.)
TL;DR either less that $100 or more than $1000
In my humble opinion.