This was probably mentioned already, but I just remembered it. I saw this at MakerFaire:
http://www.arrow.com/campaigns-na/qualcomm/dragonboard-410c/
64-bit quad-core ARM
1 GB RAM, 8GB eMMC
Wi-Fi, BT 4.1, GPS
2+1 USB
µSD
HDMI
While overkill for my particular project (I certainly don't need 4 cores or 1 GB RAM), it has Wi-Fi, 8GB eMMC, and audio out, which are exactly what I need.