After much umming and ahhing about which dac/amp to get for my phone I decided upon the JDS Labs C5D:
Only received it last night (kudos to Headphoniaks in Spain for the great service & stellar packaging job) so only been able to use it for a few hours, but so far I'm really very pleased with it. I wanted something that would give me comparable SQ to my home O2 & ODAC set up and early impressions are that it more than holds its own
Quick update: I mentioned earlier that my ODAC worked fine with my Moto G but the phone's volume control was disabled. I've since discovered that volume control does in fact work, but I need to power off the phone beforehand or it doesn't detect the ODAC properly - had previously just left the phone in stand by / sleep mode.