im not going to give any suggestions on make or model, but i must say that radioshack, etc. dont neccisarily sound bad, it totally depends on what you are looking for, and the install and use of them. no matter what, dont send them any signal they cant reproduce (i.e., dont send them a full range signal), and dont over power them or under power them with a clipped preamp signal.
get whatever tweet you want and use a hole saw in the appropriate diameter to hollow out the factory tweets. the hole saw should only cost you a couple bucks (assuming you have a drill), and it works very well. then you can flush mount the aftermarket units in the factory housing.
