I can't comment on the pros/cons of WP6 v. WP7--I use 5.1s and a REL Stadium 3. However, on a general note, I find that the sub is the most important speaker for HT. It sets the mood and draws you into the movie more than other speakers. This goes for any kind of movie. Sure, clear dialog is important, but IMO the sub does more to allow you to suspend disbelief while watching a movie.
