Nice!!
I use to have the SA-GX650!
Back then I had them with the Technics SB-LX90 (Fronts) and SB-AFC32 (center) and SB-CS22 (surrounds).
In general, it wouldnbe good to have the same series of speakers in the Fronts and center.
The surround doesnt really matter.
Currently I have 7 Klipsch, 2 Polk and 2 Jamo..