so yeah, 6x9's aren't great for quality due to their flawed design. the oval shape and "largeness" to it makes it sloppy, kinda like how people don't use 18's in a daily setup(usually) because they're sloppy. what would sound better is a pair of 5x7's or better yet, some 5 1/4's. you can make your own bracket/plate/whatever you want to call it to mount the different sized speakers to the 6x9 space, if you decide to go that route. but yeah, infinity makes good stuff if your just going to get 6x9's. i really like boston acoustics too, but i don't even know if they make 6x9's, as dumb as that sounds. alpine type-x is good too, a little pricier though, don't know how much your looking to spend.