I have personally not heard a better sub-$1000 DAC than the Gungnir, though I'll admit to not having heard some of the options referenced here. I solidly prefer my Grace m903 to the Gungnir, but that doesn't imply that the Schiit isn't good for the money.
If you can stretch a bit and are willing to go used, you can step up to a W4S DAC2 or perhaps a used NAD M51. You might also wait a bit for more reviews on the newest offering from Teac, which looks quite promising.