I like Amazon HD for general use across genres. Amazon has spotty classical coverage, so also use Idagio, which has better search and better new ideas. Savings on Amazon pays for Idagio. I can get music ideas elsewhere than Amazon. I kind of like having "ultra" on Amazon via straight FLAC playback (i.e. no MQA) in exclusive mode, but in the end I don't miss it on Idagio (which is CD quality)\; not a big diff between 24/44.1 and higher resolutions if you're listening to the music more than equipment, and if you're not being really analytical and doing A/B comparisons.