I would opt for the QS8's over the QS4's for their greater range and power. From what others have said over the time I've been here, the VP100 to 150 doesn't sound like as big of an upgrade/difference as the the QS8 to QS4 would be(we're splitting hairs a bit). On the other hand...because your room is fairly small, you may opt to stick with your original plan and just buy a few more movies with the extra $$!

Half of communication is listening. You can't listen with your mouth.