I just noticed that your Grace 903 made it into the top (A+) category in Stereophile's "2012 Recommended Components Digital Processors" list, beating out DACs that cost much more including the Zodiac Gold / Voltikus power supply bundle @ $4495 among a few others from makers like Bryston, Esoteric, Meridian and Bel Canto.
So congrats! I don't think there's anything to be concerned about
Thanks for this link -- I hadn't seen that list before. I recall preferring the m903 over the W4S DAC2 in many ways when I compared them head to head. The fact that the m903 also has a headphone amp that sounds great with the HD800 (as well as Grados and Denons) was kind of gravy at that point.