Mike - Sounds like you've done your homework. My friends who have tried the Squeezebox route have been less than thrilled as well. I've tried the Airport Express and did like it as a digital stream through the mini-Toslink cable into my DAC. Waveterminal does it better though, but wired of course. Which DAC will you be using (or does the Meridian have a digital-in)? Should the HAG not make it for you there's plenty of alternatives. If budget is not a big consideration, I'd be looking at Empirical Audio's stuff to implement PC Audio. I had a Waveterminal Brick that I enjoyed very much. It is a USB-only DAC that uses a single 12AU7. It definitely had a very relaxed sound without a trace of digital harshness. I'd be curious to hear his much more expensive Cosecant DAC. I look forward to hearing your results with the HAG. With a Meridian 508 to compare to, it'll be very interesting to hear how things pan out for you. You probably know also that it is critical how you Rip your files to the hard drive; Preferably as WAV or in a lossless format, and make sure to have "error-correction" checked if using iTunes. If you rip music as compressed files I doubt you'll ever be happy with them if you are very discriminating.
Marco
Marco