Congrats, nice choice, I would actually choose the same thing between two TV sets. Honestly, I would never go back to any smaller screen/monitor, it just a pleasure to work on. Make sure you'll buy an active adapter, so it can drive 60Hz, like this one
https://www.amazon.ca/gp/product/B00S0BWR2K/ref=ox_sc_sfl_title_1?ie=UTF8&psc=1&smid=ANO99AFAXRIXA
I am still waiting for price to go down for last year 55X930E in around $1300 mark. Sony 900E is a nice set except it will never support Dolby Vision.
I used to have VIZIO SB4051 5.1 SoundBar for sound, and that worked well for sometime except it is not as straightforward for different audio sources (TV apps, mac, Apple TV) you need to change audio settings. So I put it for sale. TV speakers actually are not that bad if you consider the easiness of operation, other than that get yourself AirPlay speaker (HomePod, Sonos or build one -
http://www.balcells.com/products/how-to-build-an-airplay-speaker-for-under-$100.html) so you can easy stream to them. I build my own Airplay speakers and I like their versatility.