Re: Adding Additional Speakers
Personally, I'd keep the S1's as the fronts and add two HTM200's or the 170's your looking at.
Not sure how well your placement will work as surrounds as where shown is more like rears. If you definitely want to use stands, maybe space them further out (like at the rear corner of each sofa). Alternately, get the HTM200's and hang them on the wall (if possible) on either side of the sofas.
* LG OLED65E6P, BenqHT2050A
* Anthem AVM90, Rogue ST100, VTV Pascal 7 ch
* Sierra Towers/Horizon (all ELX RAAL), S2EXv2 surrounds, HTM200SEx4 heights, Rythmik E15HPx2
* VPI Classic 1+ (VTA & Fatboy Gimbal), PE Eagle/RR, VAS NOVA, Soundsmith Paua, Manley Chinook, Bob's Devices SUT, SugarCube 1 mini
* Oppo 203 & 103D, EverSolo DMP-A6
* miniDSP Flex, Audiosensibility & Blue Jeans cables, Symposium & Isoacoustics, GIK
* For RDJ: Anthem MRX720, Sierra LX, Luna Duo v2 center, CXNv2, TBD