I am currently running a BA CRC center and Bravo (6 ohm) for mains and surrounds. I originally had VR-975 and a VR-12 before I had a brainfart and sold them.

This setup is not very good for movies since I have to continually adjust the volume for quiet passages to hear and for loud passages so I can hear .

The VR-975's had no problem filling up an even larger space in my previous home (40x20x9), so my guess is the 1070 and VR3/VR-12/VRM60 should have no problem.