my first truck went through a few different setups and what I settled on is 5.25s in the doors and a small woofer behind the seats. it's a tiny cab. you don't need to spend much to get decent sound. If you're not going with an external amp, make sure that whatever radio you buy comes with an internal amp. I found out the hard way that not all of the cheap ones do. it played music, but couldn't get loud enough to be heard on the freeway.