My favorite brands:
MB Quart
JL Audio
Infinity
Polk Audio
Boston Acoustics
JBL
Kenwood
Pioneer
I had MB Quart components which were in my last car...that I didn't remove...(doh) I now wish I had... (hand) I got used to the bright tweeters, and now everything else sounds mushy, especially these co-axes that I have now, but there really isn't a comparison...$70 co-axes to $300 components. My best advice is to go in and listen to as many speakers as possible, and choose what you like sounds best.