I've been trying to figure out what I want to do with mine too.
VP150 upgrade to a VP180??? Of course, then what will I do with the VP150 (no, I am not getting another setup for the bedroom)...
Or another set of QS8's for a bigger surround sound field (7.1)???
Either way, I am waiting until we get our house sold and get into the new place. The house that we would like to buy has a massive basement, and I am leaning towards the additional surround channels, but I know that I would like the VP180 too... At least I have time to decide...
2-M60s, VP180, VP150, 4-QS8s, 4-M3s, SVS 20-39PCi, DIY Sub, 8-Shakers, JVC RS45