Ullodea:
For what you listen to, and for your room size, the 804Ds are a great choice, but not suitable for your NAD. B&Ws are often slagged due to poor pairing with most solid-state amps. They simply reveal the best or worst of what's in front of them. The Sonus Fabers will sound comparatively colored and muddy.
The 804s use a first order cross to the tweet and are bi-amp capable, so get yourself a decent SET for the mids on up, then bi-amp with a good inexpensive class D amp for the woofs. Both amps should have similar gain, unless you get a preamp with variable gain on its second output. This latter option will allow you to fine-tune the bass output for your room and tastes.
For what you listen to, and for your room size, the 804Ds are a great choice, but not suitable for your NAD. B&Ws are often slagged due to poor pairing with most solid-state amps. They simply reveal the best or worst of what's in front of them. The Sonus Fabers will sound comparatively colored and muddy.
The 804s use a first order cross to the tweet and are bi-amp capable, so get yourself a decent SET for the mids on up, then bi-amp with a good inexpensive class D amp for the woofs. Both amps should have similar gain, unless you get a preamp with variable gain on its second output. This latter option will allow you to fine-tune the bass output for your room and tastes.