Re: Upgrade from Sierra EXv2 to ELX Towers?
Since you're 50/50 HT/music, with either the 2EXv2 or ELX I'd probably add a sub (or 2) for movies, in particular. For music/ELX Towers, a sub isn't really necessary (I have the Towers and have listened to music with subs and without, and the Towers do a great job without the sub in play).
I have the S2 (not EX, but considering an upgrade in the future) and the ELX Towers (I upgraded my v1 Towers earlier this year). I also have a pair of LX in my office. Personally, I think the ELX Towers are better than either (although the LX give them a run for the money, but I still prefer the RAAL over the Titan).
You're room is also pretty big. I think the ELX Towers would be a great upgrade. As you noted, you could use the EX in another room, sell, or move them to surround duty.
I also suggest you give Dave/Dina a call to discuss. They are both straight shooters and will make the best recommendation for your needs/usage.
* 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