Looking for a simple system

IMO, as mentioned in other posts and reading many reviews, and I’ve auditioned them for hours, get the Kef LS60’s and be done, maybe get 1 or 2 of their subs. This will outperform most of the gear mentioned above and be the simplest to own and use. If you compare the technical aspects of the features the equipment mentioned above, the Kef’s has more features and the sound quality is fantastic. 

I would also seriously consider the Kef LS60. Huge sound value with all the features you seek.

Might also consider a preowned pair of Dynaudio heritage specials or Contour 20. 

Since you are just looking for something that will allow you to stream check out  Naim products. You can find fantastic previously owned Naim Uniti Nova and there are apps that you can directly stream from.  The Nova is a Solid 80 watts per channel and has numerous connections on the back including Ethernet.  Get a REL T9x sub and you will still have about $5k left for terrific speakers. I have also owned Atoll and it’s nice as well but love the Naim sound. Good luck and let us know what you decide to do. 

For something you haven't considered, check out the Anthem STR Integrated. I have owned one, and it is really good. Superb build quality, 200 watts into 8 ohms doubling into 4- significantly more power than the Atoll. I believe the Buchardts are 4 ohn speakers, not the easiest to drive, but the Anthem would handle them with no problem.  Includes a great DAC, but no streamer for $5,000. You could easily pick up a good streamer-Wiim, Cambridge, Holo red, etc., for under $1,000 and the Buchardts and be set with a great system that offers lots of future flexibility. The Anthem includes ARC room correction technology which is really good and helps you get the best from tour system. Worth checking out.

Lots of good choices-good luck.