Thanks for the comments folks.
Still in a bit of a quandry about what to do next other than demoing.
As a background, my system is one that I pieced to together from ex demo/sale kit with the M-Dac and Sonos ZP90 (now 9 years old) being the only bits of kit I paid around full price for.
The Cyrus 6s CD played was ex demo - £400 but I've had it now for10 years.
My Tannoy Revolution DC6t Se's were £400 in the Richer Sound sale a few years ago
My Audiolab M-Pwr was £180, end of line, ex demo, bought last year, replacing a Cyrus 6vs amp.
And the Raspberry Pi streaming device - my current main source - was obviously hand built and cost less than a ton all in. It's fed off a USB3 drive with a lot of hires albums on it (most albums I listen too in reality). I do also have the option to move those files to my NAS drive if needed.
So all in all a cheap system for what I've got. Maybe not balanced.
In reality i listen through Sennheiser HD650's /M-Dac for half of my time. My total listening time is 5 hours a week, spread over 2 to 3 sessions.
So part of me thinks that there is better out there that my pieced together system and maybe I'm just due a change as some of the bits of kit are quite old!
Altertaively, I also question whether I do need to upgrade given the time I listen to my system.
I hear what your saying Questforthe13thnote about how the speakers should be the first thing I look at, but given my listening time per week through speakers, I'm not sure it's worth it. Ditto with replacing the amplifier - I have also been so tempted to take a punt on the Roksan Oxygene amp from Richer's, but even at £800, I'm not sure it's worth it.
The PI is good but sometimes flakey/jitters when playing 24/192 files through Coaxial (i'm assuming it's the fault of the PI and not the M-DAC). It's also not that functional. As it's my main source I have often felt that it is the first port of call for upgrade. But again I want something that takes in the latest streaming technology, etc, hence my interest in the Naim Atom as a one stop fix or something like the node2 as a streamer. Given that I don't need additional DAC facilities from my streamer, I'm basically after something with a Sonos like interface (which is brilliant) but with Hires Audio. Maybe I should be looking to see what the next generation of streamers brings? I too would love to have hires Spotify. Also considered sticking with Audiolab, when I emailed them about streamers, they suggested I waited for their 8300n network player to land, but when I asked when it's out, they never emailed me back.........
So in summary, I'm not 100% sure I need to upgrade, although I probably do need a new source for streaming (that can be used also as a CD replacement). However if something blows me away when demo'd, I'll go for the whole hog. The worry is (as somebody said earlier) a new different sound won't necessarily mean a better sound!
Decisions, decisions........