I ran Audyssey and the VP160 is set up exactly the same as my M80s, LCR is +3.5db and 40hz XO. I ran through some gunshot scenes yesterday afternoon and from what I can remember of the VP180, the VP160 would be it's equal or at least close enough for me.
We watched The Santa Clause 2&3 last night, I sat in my off axis seating position and I occasionaly sat in the sweet spot for a quick/rough comparison, I really couldn't hear any SPL differences and any pans that took place across the front were seemless, WooHoo!.