I use an xDuoo X10T II to feed a couple of my DAC's. It is great if you have alot of ripped FLAC or DSD (which I do). It connects to the DAC by USB and can be controlled by Bluetooth with it's own app. Works really well, but it is not a streamer. They call it a "digital turntable" for a reason. Long battery life to boot.
Thanks larcenasb and Mucker! I had been using the ifi zen dac as both the amp and dac with Sennheiser HD800S temporarily until I found the right amp. I just connected the Bottlehead Crack and, wow, what a difference. It sounds amazing!