I am starting to download favourite tracks from all my CDs in Apple Lossless as beginning of a process in which I will be shedding CDs completely.
Add to this a fair number of iTunes purchased tracks (AAC) and a whole load of 'spoken word' history and a lot of recorded FM stereo radio plays I transferred to iTunes over the last couple of years from old Nicam VHS (audio only) using MPEG Streamclip to demux them into AAC on iTunes.
Also internet radio and youtube.
The quality/sampling/bit rate of the DAC will not have any effect on the quality of what is already stored/ripped or what I will be storing/ripping in future. It will only affect the replay.
When I eventually change the Solo-Mini for seperates (FM tuner and Amp, no CD player though) and upgrade the laptop - to something with SPDIF output - over the next couple of years then I will get a higher quality DAC.
So, for now, something like the Fubar II USB DAC will be perfectly good enough for replay from the laptop through the Solo-Mini. I am not planning on buying any more new CDs (except where there is absolutely no alternative and then I will just use the laptop drive to rip it to iTunes)
I have had it with CDs basically and look forward to an LP, FM and computer/internet music sourced system with no CDP.
I have no intention of going down the AVI/ADM9.1 route (my love of Vinyl and FM radio rule that out) but something like a decent Valve integrated (eg Prima Luna Prologue) may be on the cards!
Thanks for your help and advice and suggestions. I will let you know how things go with the Fubar USB DAC as I intend to get one in a couple of weeks time.