I would go with a Wiim Pro amplifier, and choose some good passive speakers. In terms of ease of use, this is excellent because
1) It has a HDMI ARC port. That means the TV's audio can be routed to the Amp/Speakers. The power and volume of the Amp is controlled by the TV's remote (using HDMI CEC), so it's seamless to use as TV speaker replacement.
2) It handles all the streaming services....and supports casting via Airplay and Chromecast.
3) Supports multiroom audio....just add more units.
Pick a good passive speaker like a Wharfedale 12.1 and you have yourself a great hub for all your music needs and the system acts as a 2.0 or 2.1 music centric system.
Also it has a proper subwoofer output with a user adjustable crossover (a real crossover is missing from most consumer amps until very recently). This is a biggy if you ever want to expand to 2.1. Previously you would have to spend a lot more for either a AVR or something like a Bluesound Powernode for an amp that properly supports a subwoofer.
If you don't want passive speakers, the alterantive would be the ELAC Connex powered speaker. This also has HDMI ARC connection so it is also seamless and your TV will control the speaker's volume and power and can route its audio to the speaker. The Connex has other inputs so you can hook up other audio sources as well if you have a streaming box.
But overall the Wiim Pro is a game changer and seems like the best solution for a one-and-done audio system.
