You can, but you probably shouldn't, especially if you are a newbie. It is critically important that the front and center speakers match very closely. You can be a bit more forgiving with the surrounds.
$1000 for what, an entire 5.1 speaker package? In that case, you should definitely audition Paradigm. They do low-cost speakers about as well as anybody.
$1000 for what, an entire 5.1 speaker package? In that case, you should definitely audition Paradigm. They do low-cost speakers about as well as anybody.