My collection is basically all digital lossless (flac, wav, tak, ape, blah blah), majority is CD quality instrumentals, vocal, ethnic, and lots of original soundtracks (OSTs on a good DAC is heavenly).
Lately, I've been getting a ton of hi-res recording at 96khz mostly, mora.jp, some 48khz and a little 192khz. I've also tried DSD iso at several gig a piece, eg: Suara DSD on the Directstream, didn't sound good either.
Right now I'm testing the Emotiva XMC-1, this thing sounded so good that I'm not sure if I should keep it and go multichannel again or stick with the Metrum when it get's back...