I agree with Ken. The 60s would play nicer with your Sony. Can you give us the dimensions of your room (HxWxL), or more accurately, the dimensions of the listening area you wish the speakers to cover (if different from the size of the room)?
The primary difference between the QS4s and QS8s is that the QS8s will play louder thus doing a better job covering a large area (they also extend a little deeper in frequency response, but IMHO, that difference isn't a huge one). The same is true for the VP150 and VP100.
Don't misunderstand. I used QS8s in a QS4-sized room, and loved them. If you want them, and they fit the budget, by all means get them. But, if you're trying to save money, unless your room is a large one, the QS4s would serve very well.
