Welcome.
It is hard to advise you, as you have not said a lot about current needs, and especially futures needs and desires.
I used to be pretty much an audio only guy. I made the leap into AV in 2006. Things were still relatively primitive then. Now the technology and quality of streaming has expanded. I suspect that you are in the UK from the gear you have, but I don't know for sure.
If you want my view, audio only systems have had their day except as office background music systems and similar installations. Now I do not own an audio only system. All my three systems are integrated with video. Apart from giving you more and better equipment options, video adds immensely to the enjoyment of music. More and more orchestras and opera companies are turning to streaming with excellent audio and video. In addition, the BBC, as far as the video is concerned, their iPlayer offers the highest audio quality of all their services and it is excellent.
Once you get past the audio only you have numerous options. Many options can not, or are not fully functional without a screen.
Your current Tag unit is way out of date. There really is a whole exciting new world out there and missing out on adding quality video, to quality audio, even if you are a die hard audio enthusiast is a bad mistake.