Oh the anguish of making a decision without listening to the options

With no dealers in Australia, although a very helpful one in NZ ......but unfortunately it is still not the same as actually listening to the gear.
I have a pair of KEF LS50's on my desktop and I am torn between an IDA-8 or a DAC-9 + STA-9 combo.
Source files are FLAC, pop, rock, blues and female vocal. Being on a desktop listening volumes will only occasionally be room filling, but never just background.
Really don't want too much gear sitting on the desk which makes the IDA-8 an obvious candidate, but a higher priority is I don't want to miss out on any clarity, detail and musicality,..... just love some of the subtlety you can get in instruments and a lovely voice like Eva Cassidy.
What are the tangible differences that would set the DAC-9 + STA-9 combo apart from the IDA-8 that would help me decide ?