Budget streaming amp

Amazon Echo Link Amp?

Budget friendly @ $300
Attractive
Alexa capability 

I had the NAD with BluOS. I didn't care for it at all. It was very sensitive to phone location plus it just didn't sound good with Bluetooth. I went with the Marantz ND8006 CD/network streamer (via WiFi) for $1200. Sounds wonderful! 

Have you looked at any of the Raspberry Pi options? They have a variety of RPI based amps that could convert any speakers inexpensively. 

The R-N303 is entry level.  No balance control, power spec is a joke, etc.  Look at the R-N602...much beefier, full features (including variable loudness, balance, B&T) and uses their ToPART concept. Sells for $599.95.  The $749.95 R-N803 adds their Room EQ concept, YPAO.  I'd normally skip that, except for one thing, it automates the variable loudness and incorportes the room EQ measurement into the algorithm, so like Dolby Volume (never found on a stereo), it works better than any conventional loudness, even their own.  So if this rig is often going to be used at levels below "reference", that could be a winning feature.  

I have Bluesound products, but not the Powernode.  They sound ok, probably not much more you can do at the price point.  I heard the Yamaha at a dealer, not in my system, but sound wise I thought it bested the Node2 when the latter was played through the former.

The Powernode is sonically the best choice.

IMHO the best sub $1000 amp/streamer is the Marantz pm7000n - check out the online reviews. I have it in my office system hooked up to some LS50s and am ecstatic about the sound/features/value of the setup.

Thanks for the feedback @panzrwagn 
It looks like there are two versions of the Sonos Connect Amp - ZP100 and ZP120. I believe the ZP120 will work with the new Sonos S2 app. If I am understanding S1/S2 correctly, someone may need to use both the S1 & S2 apps independently to operate various Sonos products. Everything will still operate, but 2 apps may be needed. Crazy!

S1 only Sonos components 
Zone Players
CR200
Bridge
Connect (Gen 1)
Connect:Amp (Gen 1)
Play:5 (Gen 1)

That's pretty good choice. 

That is the original Sonos Amp - the one that Sonos was going to brick, then changed their minds under consumer pressure.  So now it's on a dead-end app (no patches/ugrades) while newer amps will be on a different software platform entirely. That said, I had one for several years, and it was a rock. But, Sonos had taken that platform as far as it could go, that's why the new generation. 

You could also look at the Marantz NE-9000, it's $1000, but, it's a complete offering, including Echo and Google Home control.

Or, roll your own by adding an Echo Show to any integrated amp with either Bluetooth or a 3.5mm-to-RCA cable. That gives you streaming, voice control, and a 5', 8", or 10" display. Only the full-size unit has a Zigbee hub, if you want to control lights, etc.

Lucky to get what you pay for with Sonos.

Streaming + an amp! Bargain of the week!

The $200 Sonos Connect amp is the best choice here! However, I just checked the eBay listings and I can find none at that price. There are several at auction for more - apparently the Sonos Amp is a highly-desired component! The best one I found was from seller "luvpame16" - $299 + $13.20 shipping from Chino. CA. This one was gone over and refurbished with improvements. I would buy this one over a stock unit!