Going in a very different direction, I got tremendous results from the Schiit Loki DSD only DAC, which offers incredible sound quality period, but is an unbelievable bargain at only $149.
I used JRiver to upconvert all my PCM to DSD64 the fly for the Loki and in addition to it sounding great, I can't imagine doing better on the price/performance ratio.
There's a recent review on Audiostream.com and the author's experience was like mine.