Sorry, SutterCane. My real job beckons.
My advice is theoretical only. The only one of the speakers in your question that I own or have heard is the QS8.
Based on NeverHappy and Ray3's experiences with the VP100, that is what I am going to buy (am currently using a center from another manufacturer and have other, higher priorities). Although TonyM does have me thinking about two M2's instead, but I digress.
I vote option 1. The QS8's have bigger drivers and a bigger box, which enables them to produce appreciably deeper bass response. This ability may help you measurably relative to not only HT but also multichannel audio. I love mine.
