Stay with what you already are intersted in(i.e, the B&W 804's or whatever). However, if you are into zepplin or rock in general, BIAMP THE 804'S!!!! Find a good strong used excellent BASS amp(like Parasound HCA3500, w/volume controls for ch's), drive the bass woofers with the 350w/ch Parasound(again, excellent bass amp), and use the better Macintosh on top!!! The sound will be very very dynamic for your needs, will sound very refined on top, and you'll be pleased..trust me! I know, I've used all the stuff we're talking about here for years!
Good luck
Good luck