How would you upgrade my entry level system?

You can do some great room treatments for free or cheap.  Spotify and Pandora have very poor sound quality. Some love the 105 for CD and some not at all. Sonos Connect also has poor DAC and a high jitter signal from digital out. 

BTW, I always recommend GIK for being pretty, effective and inexpensive.

Five grand in the context of your current system is a lot more than an upgrade and in my book calls for some serious thought.

Sounds like right now you are mostly using it for playing background music. With maybe some occasionally more dedicated listening. The point of this isn’t to see how good I am at guessing games. Its to get you thinking.

Which matters more, how great it sounds sitting in one precisely defined sweet spot? Or anywhere around the room? How likely is this to change over time? Ditto the room- will you be staying put or moving?

What are your more longer term goals? You could plow the whole five grand into a classic highly regarded speaker, one so good you could spend the next however many years building an awesome system around them and still love them. Or you might be a whole lot happier to budget the whole five grand to a whole new system.

This kind of thinking it through approach is the only way I know of getting anywhere but broke. Anything else boils down to asking a bunch of random people how they would upgrade a bunch of stuff they never would have bought in the first place. Which you just did. And got a good answer anyway.

Thanks for the responses.
Guess I have some thinking to do.
short term: try Tidal streaming. Consider non Sonus option. 
Medium term: consider upgrade on speakers and then build new system.
I like the existing sound.
would just like to more captivated, can't articulate it any better than that.

Get a pair of Tekton DI's for $3K and sell or put those Audiovectors in another room! Changing speakers will make the most difference (and improvement) over anything else! Honest!