If you replace the speakers, 95% chance you'll have to replace the amp.
Maybe add a powered sub woofer.
It was a pain, but i changed everything out in my Silverado.
Pioneer 80-PRS is clunky, but very good sounding (for the price) head unit.
Warning: It has the "pico fuse" problem.
Never change RCA outputs on it without powering down.
However, noise level on it is practically non-existent.