OP
you will definitely note an improvement with either streamer that you are considering, primarily because the DAC in either will be a huge upgrade. So you could just buy a DAC and keep using the computer as a source. I think that you may be happiest with a dedicated streamer-DAC combination, as ease of use seems to be important, but if you like using the computer from a purely sonic perspective the biggest need that you have is for a decent DAC