Audio-GD Master 7 $2400 new. This is a R2R ladder dac which can be set to non over sampling. Does not do DSD. 24/192 is the highest. I have had a bunch of dacs but this is the best I have ever heard
For "Bit Perfect" conversion of PCM you need a dac that has R2R Ladder Multibit D/A converters. The better implemented the better the sound. many top dac are going back this way again.
EG: If you can afford them just some of the top ones
Audial (Peja Rodgic)
AMR top dac and cdp (Thorsten Loschec)
DaVinci Light Harmonic
Forget Delta Sigma based dacs, (bitstream,1 bit,Sabre ect) they just don't do PCM (RedBook cd,DVD-A,DXD.) like a R2R Multibit d/a converter can.