The easiest choice would be the ubiquitous Bluesound Node although not sure how good its headphone amp is but I assume it’s not great. If you can get by with only Bluetooth the PS Audio Sprout100 could work. My choice if sound quality is important would be an iFi Zen Stream and Zen DAC — yes they’re separates but they’re quite small and likely take up not much more space (or maybe even less) than an integrated unit. Hope this helps, and best of luck in your search.
Streaming Headphone Amp
I'm looking for a streaming headphone amp as a solution for my office. It needs to be comfortable driving my HiFiMan Sundaras. Due to space limitations it must be an integrated unit, hold the scold, I simply do not have room for a separate DAC and amp. Price should be under $1000. Thanks.