LS50 center is the right idea. KEF Q100 or Q150 would be the ideal candidates for surrounds.
I'm not sure how to integrate the LS50 wireless into a HT system, but why spend that much?
Spend it on the sub. I suggest an http://www.hsuresearch.com/products/uls-15mk2.html
For a charge you can get it in Rosenut, but if it is going to be out of sight, just get black.
There is also Power Sound Audio (PSA): https://www.powersoundaudio.com/products/S1510
Keep the receiver so you can make it all work and keep HDMI switching, audio format decoding, bass management (subwoofer), etc.
I'm not sure how to integrate the LS50 wireless into a HT system, but why spend that much?
Spend it on the sub. I suggest an http://www.hsuresearch.com/products/uls-15mk2.html
For a charge you can get it in Rosenut, but if it is going to be out of sight, just get black.

There is also Power Sound Audio (PSA): https://www.powersoundaudio.com/products/S1510


Keep the receiver so you can make it all work and keep HDMI switching, audio format decoding, bass management (subwoofer), etc.