Mine is even lower than the clarion. My original receiver actually still worked fine. I just got a Pyle radio off of ebay. It came with speakers and the cover. I thought about getting a nicer head unit, but that is not even what I needed as much as the speakers themselves. It sounds fine for my needs. If I have to replace the head unit in a year or two, I will upgrade to a nicer unit. This one does have some nice features though. It has the AUX out, USB slot and SD Card slot.
Another note, I do not and cannot have tower speakers currently just bc of the way the tower is made and the height of the garage door. I have to remove the top section every time to get it into the boat house, so for now, cheap works for me.