I almost always recommend Alpine. I used the s types speakers in my car a few years back. I converted the 5 X 7's to 5 1/4" because I oval isnt as crisp as circles. That being said, you cant push as much sound through 5 1/4" but I have never had a problem with it. I helped a friend install a Alpine INE-W927HD, and was really impressed with the functionality. He dished out a pretty penny for it though.
07 Mustang Gt
Borla exhaust with STS tips
"You win some, you lose some, you wreck some."