I am combining B&K Components with Vienna Acoustics too. I recently purchased the Reference 50 s2 Pre-Amp with a Reference 125.7 s2. I am combing the B&K stuff with the Vienna Acoustics Schonberg Series:
3 Webern on walls for the L/C/R
2 Borg on walls for the Rear Surrounds
1 Subson for the Subwoofer
Both the B&K and Vienna Acoustics have some serious build quality (really heavy duty, well made, beautiful speakers and components) and my home was already prewired for 7.1 surround with 12g speaker cable so the on wall application was perfect for our home.
It has been driving me crazy though because they have been sitting on the floor of my living room for over a month while I am having a built in media center made and I still haven't hooked them up for a test drive.