It sounds to me that you will probably be listening to your system at modest levels, since you are using it in a bedroom environment. Therefore, I'm sure you'd be fine with the VP100 and QS4 combo...if however, you want to future proof a little, I would upgrade the Q's to the 8's before I would consider moving up to the VP150 over the VP100. This is based on what I've read on the forums, not personal listening btw.

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