Suggest a new amp/preamp/Dac streaming combo

I would start by looking at the available network players, such as this list:

https://www.musicdirect.com/Equipment/Network-Player/?category=Network%2520Player&sort=popularity%7CDESC&page=1&pagesize=24&c1=tab-products&c2=grid

They all have different price points and different sonic signatures. For example, Marantz is voiced to sound warm (like your B&K amp).  Cambridge is the complete opposite as being highly transparent with a lot of detail and attack. 

Sony HAP-Z1ES has been cited as a really excellent device:

https://www.crutchfield.com/p_158HAPZ1ES/Sony-HAP-Z1ES.html?tp=254&awcp=1t1&awcr=196736641108&awdv=c&awkw=%2bsony+%2bhap+%2bz1es&awmt=b&awnw=g&awug=9032294

Some of these network players can act as a preamp, so you could still use your B&K amp if you still liked the sonic signature.

I think dedicated network players are going the way of the Dodo, just as dedicated wordprocessors once did (remember those?). After all, each time a new service is introduced, either the service provider or the player manufacturer will have to develop a new app, and that for many services and many players. The same was true for smart tv’s or disc players with streaming abilities. It is just not a viable business model, and as a user you are stuck in a dead end street.
The alternative is either using a pc of one kind or another, with its universal browser (the Raspberry Pi is very popular for this, but any laptop will be just fine), or streamers by market leaders like Google (Chromecast) or Apple (Airport Express).

Yes, this is somewhat correct. But there are other things to think about than just "keeping up with the technology". Sound quality is a huge consideration. I understand that those measurement results of the Chromecast show very low distortion, but measurements don’t always show things like sonic signature, jitter / clock accuracy, switching-power supply interference, etc. I have used the Amazon FireTV as a streamer device (which is very similar to Chromecast, Apple TV, etc). The audio quality through HDMI was actually worse than my cheap old Sony bluray player (not to mention an Oppo player). Video streaming had it’s own problems as the FireTV could not successfully transmit video without frame jerks (such as 30fps or 60i or 24p). The Sony and Oppo players were significantly better as transports for streaming both audio and video.

Laptops really do not make good transports as the USB (or even HDMI if a laptop has it) will not have good power supplies or localized USB circuits.  USB Reclockers (like Wyred 4 Sound Recovery) can help, but it's still not optimum.  Desktop computers can be better if you have good USB or SPDIF cards (such as SOTM, Xonar Essence, Pink Faun, etc.). But they still are not as good of a transport as a dedicated network player with proper SPDIF/USB/i2s interfacing and good power supplies and digital clocks.

In the end, it really depends where you want to put your money.

@willemj - It is entirely possible that scott69 would be fine with a laptop transport.  It entirely depends on your sound quality threshold and whether or not you can hear the difference in your system.  With the very warm sounding B&K amp, it may not be apparent.

However, I'm just documenting that there is definitely a difference between laptop / desktop / dedicated-transport. For example, I have the following transports:

Dell laptop with upgraded high capacity power adapter - USB output.

Asus bargain basement desktop - USB output

Asus bargain basement desktop - Xonar Essence COAX digital output

Through listening tests, the Asus desktop USB was superior to the laptop USB.  The audio from the laptop USB just sounded weak without power and impact, and also has somewhat of a dirty grain to the sound.

In comparison, the Xonar Essence digital coax output sounded much better than the Asus motherboard USB output.

I was using a custom made USB cable with 24awg solid-core OCC copper conductors and with the USB power wire removed.

I'm sure I could improve things by putting in something like this:

http://www.pinkfaun.com/index.php/products/streaming-audio/pink-faun-spdif-bridge.html

The Pink Faun card uses a massive capacitor power supply array to further filter and smooth the voltage coming from the computer switching power supply.  The SOTM USB card uses a similar approach by routing the voltage through several regulated/filtered sections.  Or you can improve things by upgrading the computer with a Teradak Computer Linear Power Supply (which I will probably do next year).

Probably the only thing I agree with you on is that the Oppo 205 would be a good recommendation for a disc player / DAC.  Yes, he could connect this directly to the B&K amp and it would sound very nice.  Put an upgraded linear power supply in the Oppo and it will be a force to be reckoned with.  However, scott69 also has a radio tuner.  This will require some type of preamp or integrated amp because the Oppo does not have an analog input.  If scott69 wants to stream from Spotify or Tidal or something else, he will still need to get a streamer (though he may not need/want this).