getting into streaming

Fwiw, I 100% agree with @moonwatcher here. I wanted to get a cheap streamer to get started (while I figured out what I wanted longer term). The WiiM mini has been excellent. Im using Qobuz hi-res using the optical out into my DAC and it’s great. 
 

I think my next purchase will be something in the the Innous range or an Auralic Auralic interests me because they prefer you to use Wi-Fi over Ethernet which is interesting. 

Easiest way to get started is to buy a Bluesound Vault. It is a High-Res 2TB Network Hard Drive CD Ripper and Streamer. Everything you need, and there are few if any better, more intuitive interfaces than BluOS.

I am in the same boat as the OP. For me it is either a new Bluesound Node 130 or a used Lumin D2. From everything I have read and absorbed it is really hard to out do the Node at $600, and you can always add a higher quality DAC and better power supply later. I also think that the BlueOS is about as easy to use and intuitive as anything else out there. I believe the Lumin would be a better sound, but it i hard wired only and the interface is less user friendly.

yes, despite some time having passed since i went through most of the starter streamers, i think the leading contenders are still

bs node (latest version)

cambridge cxn v2

innuos zen mini (used, as innous has phased this out for more expensive models)

ifi makes several models, very affordable, some with dac, some without

there is also the wiim puck... very inexpensive

Just wanted to note that both Cambridge Audio and NAD came out recently with some great (at least on paper) entry level streamer/DACs...so you might want to take a look at one of those as perhaps a "step above the WiiM Mini" to feed your CD player's internal DAC.  Cambridge has the the AXN10 and MXN10 network audio players, while NAD has the CS1 Endpoint Network Streamer. 

Figure they were getting eaten alive by the lower cost models by other manufacturers for newbies wanting to get into streaming and see what all the fuss was about, so they decided to come out with these.  Competition is a good thing. 

Maybe these might be worth a look.