Unfortunately, I don't know enough about your specific speakers to discuss their power requirements. However, if you already have the 200M's, I understand your reluctance. If the 1070 has sufficient power to drive your center and surrounds, I think that is the way to go personally (this assumes the sound quality of the 1070 pre/pro is close to that of the 950).
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra