I think you will like the 990. I certainly did. If your happy with the GFA-6000 and are only looking for a cosmetic improvement, then I am not sure you can go wrong with running 5 channels into the 7125. Personally, unless you are in a very noisy electrical environment, I am not sure that the paying extra for just balanced inputs is worth it.
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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