I auditioned the N804 and Cantata. In the end I felt the Dunlavy's were superior in there accuracy and smooth sound. B&W, to me, is too much of a mass marketed speaker. They come out with a new line, series, model every 6 mos or so it seems. When I shell out my money I know that with B&W a lot of it is going to their marketing budget not product R&D and materials. With Dunlavy I get the feeling that John is "in there" somewhere. His upgrades and new model intros are few and far between and only when they make an improvement to the product.
I'm not familiar with the Parasound amp so I cannot comment. However in my quest for an amp I'm not auditioning a Goldmund Mimesis 28+. This is the sweatest, smoothest sound I've ever heard from the Cantatas. This amp makes you want to turn the volume up because it keeps getting better and better. This may be a winner!