Mike, I tend to doubt that you'll ever hear any difference between DSD and a similar bitrate of FLAC with a good playback system. I have a ton of SACDs, which I play with a Marantz SA8004, a player that's not exactly a slouch, and it still doesn't sound quite as good as a 96/24 FLAC played back through my Emotiva DC-1 DAC.I'm sure FLAC will be more than adequate for my system and aging ears.
I guess I forgot about this thread, but I started getting HD downloads from HDTracks a year or so back. My main system is set up for music as the #1 priority. I use an analog Emotiva XSP-1 pre-amp and the DC-1 DAC for HD music, with the files on a HD connected to an Oppo BD-103. It sounds spectacular. One nice thing about this setup is that since the Oppo has an app, I can control it with an iPad and don't have to turn on the TV a surround pre-amp to play HD music.
For anyone who wants the best music playback they can get for a somewhat reasonable price, the XSP-1 pre-amp and DC-1 DAC really are amazing. They're not exactly cheap, but they both sound like 4X their price.
I've gotten mostly Classical in HD, but a couple real standouts in Rock are Aqualung and Crime of the Century. You can also get Rush "Sector" collections for a song when they're on sale. I think I got One and Two for less than $50 total. That's eight studio and two live albums. Quite a deal.
A particular standout in Classical is the Joshua Bell/Michael Tilson Thomas recording of Tchaikovsky's Violin Concerto with the Berlin Philharmonic. That one is an absolute MUST HAVE!!!