Cambridge units look good, but, the DAC implementation in them is bad ( built by low iq dudes)
Are these high end streaming devices worth the money? I'm guessing the DAC is better on the high end streaming devices vs an Apple TV? When you have a decent receiver with a good DAC do you need to spend the extra money?
I will try and simplify it for you before some guys give you advice that will empty the bank account. In some cases, a good streamer/networkplayer+DAC combo unit can sound better than its implementation in a receiver. But, this may not always be the case for you, depending on how resolving your system may be.
Let's say you have a very good receiver like a Yamaha RX-A3080. It already has a phenomenal streamer/DAC implementation. Some Pioneer Elite receiver models used to have a phenomenal DAC implementation as well when you get higher on their chain. So what do you do without wasting cash? I think you're looking at a streamer/DAC combo because you are trying to setup a 2 channel system and you bought some 2 channel integrated amp?? Don't buy a separate streamer yet. Convert your receiver into a streamer and see how it sounds!!
Do you know that your receiver has a feature called ZONE 2? Connect your zone 2 lineout to the integrated amp. There should be an option to set the zone 2 lineout to a "fixed" output. Now, shut down your main zone and keep your zone 2 on....Eureka! Now, your receiver just got converted into a great streamer+DAC feeding your integrated amp. If it sounds really good, don't buy a streamer!!
But, you could be a unsatisfied guy. And this is the time when all the large fat snakes come out and start soakin you in snake oil. Guys like Kevin from Upscale Audio will show up dressed like a gimp and start giving you a nice sensual snakeoil massage! He will try to sell you a "music server" for 5000 dollars! bwaahahaha , If you were smart, you'd btchslap him all the way to Chinatown.
Now, keep in mind that diminishing returns will hit you like a brick pretty quick when it comes to DACs. But, there are some standalone DACs that will definitely sound better than the one on your high end receiver. But, they will cost a lot on their own. Try something like a Denafrips. Holo, etc R2R DAC (3k to 5k dollars). Yes, you will have to spend that much to see a 'significant enough' jump up from your good ol' receiver with its DS Dac. Plug your laptop into a Denafrips through the USB or a better idea is to get a optical from your PC (if it has one) into your DAC. It will sound pretty good.
Now, if you are still unsatisfied and you want to get that laptop or pc out of the chain because somebody told you it is noisy as fck (even though your ears may not have quite heard it). In that case, you can get something like a cheap Yamaha WXC-50 streamer TRANSPORT for 250 bucks. You are using it as a TRANSPORT only i.e connecting any one of its digital outputs to the DAC. The DAC itself on a WXC 50 is weak, it's intended design is to solely serve as a transport.. There is absolutely nothing i have seen that is able to beat a Yamaha WXC-50 used as a transport (for the quality and features it offers for a 250 to 300 dollars) IF you are only using it as a transport.
If you spent more on something like a Bluesound or a Marantz NA6006 or a Cambridge whatever.. and using it as a transport into a good DAC like the Denafrips, you are wasting cash because you're dropping money for the bluesound/marantz/cambridge etc built in DAC which you won't use.
Hope that gives you an idea.