Hello John
I have been in the digital world for quite a few years now, having got sucked into CD's early on and then into mp3 and AAC which I quickly discovered was a step into compressed music and questionable replay quality. I should have known better as I work in the IT industry. One thing to remember here is that music that was digitised and put on CD or a digital file back in the 80's and even the 90's is not necessarily going to be of great quality due to the limitations of the technology at the time, and even new music may not be great. This also is influenced by the care taken when doing so and the equipment used.
Anyway I ripped my CD's to AIF or WAV format and put the whole lot onto a NAS Drive in an iTunes library, Buffalo do some good and cost effective ones. iTunes I find is a reasonably good tool for organising your music and ripping CD's although if want FLAC or equivalent M4P then you would need to rip using some other software and then import M4P files into the iTunes library. I would go for at least a 2 terrabyte one and also purchase a 2TB drive to plug into the back of it to back it all up. For FLAC and other formats that iTunes does not handle I put undo into a folder of that name on the same server organised by sub-directories by Artist and within that by album.
https://www.ebuyer.com/620414-buffal...xoCBGEQAvD_BwE By doing this all my digital music is sited on a drive that several devices can access, MAC, iPhone, iPad etc basically anything that is able to connect to an iTunes library, and there is lots of software and hardware that can. Once you have this setup up you can copy from your computer(note COPY not move, so if it all goes wrong you still have it) your existing iTunes library from your computer to the NAS drive. Once it is there you can got to preferences in iTunes, select advanced and then select the iTunes library on your NAS drive (note the drive has to be on your network and you have to be mapped to it from you computer first). You also need to ensure that "Copy files to iTunes media folder is selected when adding to library" is on so that any future music is automatically put in the library on the server.
You obviously don't need to have a NAS drive but you will be limited by the size of the computers hard drive and may end up having to plug an external one into to it in any case, especially if you are going to have CD and above quality data files.
Remember each CD will take around 450-650mb of storage as pure CD quality, the same in Flac will be around 1.2-3.0GB of storage so you can quickly gobble up 1 Terrabyte of storage if you have lots of music.
As others have pointed out there is a variety of software/hardware out there to access your music which is better than iTunes on playback and is in fact necessary if in formats that iTunes cannot handle. I like others are trying out Audirvana and so far I am quite impressed with it in terms of replay quality, plus it also supports streaming from various high quality sites. Personally I would tend to purchase and download what I like and store on the NAS drive, but that personal choice, however it does mean that if you cannot get a high mbps(internet speed) to support high quality music streaming you can download and then play later.
So it sounds you have the DAC sorted, and I presume this will have USB capability, so you can connect it to the USB on your computer, and so once you have the above set up in the manner you opt for you need to choose the software you want to use and install it on your computer, map it to the NAS drive or wherever you have the music library and to any folders where you have FLAC etc stored and off you go.
You raised the question of using a Streamer, well its a tricky one to answer and it really depends on how deep your pocket is, for my money if you do not want to use a computer then I would opt for an INNOUS ZEN, from what I can determine for sound quality the ZEN MK.II STD is the one to go for, the ZENMINI is £700 cheaper and has its limitations in processing capability, also to get the best out of it you either need to power is with a battery or an expensive £200-300 power supply. There are many other streamers out there and I am sure others on here can give advice on this. The thing is whilst a streamer is a neat and clean solution the question is how long before it becomes redundant or it fails. Most come with Solid State Drives(SSD) that's basically computer chips used to store data, no matter what anyone tells you they fail and they have a life and will fail. So another key question if the SSD fails can it be easily replaced/repaired, most manufacturers charge quite a lot above the actual SSD cost, and some won't even repair. Innous recommend have a USB drive plugged into a ZEN so it is backed up, as most others do. so the points I make here not only apply to a Innous ZEN but any other make of streaming device. If you look at other streamers then you need to consider what level of quality it can handle in terms of types of data formats and very importantly how high in Hz it can go.
KEY POINT no matter where your music is stored, Streamer with storage, NAS drive, external drive plugged into a computer or on the computers physical hard drive
BACK IT UP regularly, at least once a week. Hard Drives fail whether spinning disk ones or SSD's. You should be backing up your computer at least once a week to an external hard drive mo matter what.
I have considered the ZEN at length but have concluded that using my MAC with a good Beresford SEG DAC and putting my digital music on a NAS drive is the most cost effective and leaves for future flexibility and change.
I am sure there are a host of other solutions out there but perhaps this might address some of the key issues, at least as far as I see and understand them.
Good luck
Adrian