Thank you but the DIY home electronics approach is probably beyond me. I'm already struggling to get up to date with DACS/streamers/optical etc etc! Would prefer a plug and play approach (or as near as possible) at this point.Although I don’t feel able to offer advice on the speaker front (I own and have previously owned, legacy british made speakers from the 1970s/90s), on the streamer front, could I suggest that you have a look at something based on a Raspberry Pi, which you can then either delete from your list of possibilities or include it for further consideration?
Two options, really.
First, go completely ‘DIY’, starting from a basic Rpi, adding the components needed (e.g. DAC module, case, etc). This approach needs either a degree of ‘computer type fiddling/tweaking’ (but nothing too serious) or a willingness to learn and have a go. This is the route I followed (I am not an IT or computer expert) and now have a rather excellent streamer for not much (i.e. sensible) money. It may sound a bit overwhelming but it’s really not!
Second option; look at something like the Allo Boss player (also sold by Audiophonics in France - I only know AP by name, I have not previously purchased from them). Allo have taken a RPi 4, combined it with their Allo BOSS DAC (I have previously owned an earlier version of this) and put it inside a rather nice case. It comes with preloaded software. Price about €220 I believe.
I won’t touch bluetooth for streaming. I’m just not interested. Although I have a separate DAC, it carries out the same function as the ALLO BOSS - connection to the amp is via twin RCA.
Although my streamer gives me several options (including internet radio stations), my use is principally limited to streaming FLAC files (which I converted from my own CDs).
Hope some of this might help. If it doesn’t, then I do hope i haven’t confused the situation.